Mattermost
Monthly
Incorrect authorization in Mattermost's demote-user API allows a lower-privileged administrator to degrade arbitrary bot accounts to guest status, affecting versions 11.7.0 and 10.11.17 and earlier. The root cause is missing validation of whether the target of a demotion operation is a bot account, meaning an admin who lacks full system privileges can still weaponize the standard API endpoint against bot identities. No public exploit exists and the vulnerability is not listed in CISA KEV; its real-world priority is low given the high-privilege requirement and limited blast radius.
Subscription hijacking in Mattermost allows authenticated low-privileged users to take control of subscriptions belonging to channels they have no access to by submitting a crafted PUT request to the subscription edit endpoint. The root cause is a missing channel ownership validation check, classified as an Insecure Direct Object Reference (CWE-639), affecting versions across four active release branches (10.11.x, 11.5.x, 11.6.x, 11.7.x). No public exploit has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.
Missing authentication on the Atlassian Connect install callback in Mattermost allows a remote attacker to inject a rogue sharedSecret into an in-progress Jira integration setup. Affected versions span the 10.11.x, 11.5.x, 11.6.x, and 11.7.x release trains, all of which expose the POST /ac/installed endpoint without validating the caller's identity during the pending-install window. No public exploit has been identified at time of analysis, but a successful injection corrupts the integration's trust handshake, yielding high integrity and availability impact against the Jira connection. The vendor CVSS vector assigns PR:L, which conflicts with the description's 'remote unauthenticated attacker' language - this discrepancy warrants direct verification with Mattermost advisory MMSA-2026-00654.
Insufficient authorization checks on the bot deactivation endpoint in Mattermost 11.7.x <= 11.7.0 and 10.11.x <= 10.11.17 permit a User Manager with write access to user management but without Integrations permissions to deactivate bot accounts via the PUT /api/v4/users/{id}/active API. An attacker with high privileges can disable bots, impacting availability and integrity of automated services. No known active exploitation or public exploit code is reported.
WebSocket session persistence in Mattermost allows authenticated users whose sessions have been globally revoked to bypass that revocation and continue receiving real-time platform events. Affected across four actively maintained release branches (11.7.x, 11.6.x, 11.5.x, 10.11.x), the flaw directly undermines the effectiveness of administrative session revocation - a control relied upon in account-compromise response and offboarding workflows. No public exploit code exists and no active exploitation has been confirmed (not in CISA KEV); the EPSS signal is absent from available data, and the vendor-assigned CVSS of 4.3 reflects correctly scoped, medium-severity risk.
The /gitlab connect slash command in Mattermost fails to enforce administrator-level authorization on the setDefaultInstance call, enabling any authenticated user to overwrite the workspace-wide default GitLab instance configuration. Affected across four concurrent release trains (11.7.0, 11.6.x ≤ 11.6.2, 11.5.x ≤ 11.5.5, 10.11.x ≤ 10.11.17), this missing authorization flaw (CWE-862) is exploitable by any valid Mattermost account holder without elevated privileges. No public exploit code or active exploitation has been identified at time of analysis, but the low attack complexity and low privilege requirement make this accessible to any workspace member targeting GitLab integration infrastructure.
Denial of service in Mattermost Desktop App (versions ≤6.1 and ≤5.5.13.0) allows a malicious Mattermost server owner to crash client applications by injecting a script that calls window.open() with an excessively large URL, exploiting a missing resource limit on URL length processing. Exploitation requires user interaction - the victim must actively connect their Desktop App to an attacker-controlled server - and impact is strictly limited to application availability with no confidentiality or integrity exposure. No public exploit code has been identified and this vulnerability is not listed in the CISA KEV catalog at time of analysis.
Improper access control in OpenClaw's Mattermost event handler integration allows remote unauthenticated attackers to bypass direct message (DM) policy enforcement by submitting crafted Mattermost events that deliberately omit channel type metadata. All OpenClaw versions prior to 2026.5.6 are affected. No public exploit or active exploitation has been identified at time of analysis, but the network-accessible and unauthenticated nature of the flaw (PR:N per CVSS 4.0) makes it actionable for deployments that rely on DM policies as a meaningful access control boundary.
Private message interception in Mattermost affects versions 11.6.x through 11.6.1, 11.5.x through 11.5.4, and 10.11.x through 10.11.16, allowing a low-privileged attacker to receive plugin-generated direct messages intended for bot accounts. The flaw stems from the bot registration flow failing to verify that a claimed username actually belongs to a bot account, enabling an attacker who pre-registers a human account using a predictable plugin bot username to silently hijack those message channels. No public exploit code exists at time of analysis, and exploitation requires both an existing user account and advance knowledge of the target bot's username.
Mattermost's team creation API endpoint (POST /api/v4/teams) fails to enforce the PermissionInviteUser authorization check, allowing authenticated users holding only PermissionCreateTeam to configure invite-controlled team settings - including making a team publicly joinable via open invite and restricting membership by allowed domains - that they are explicitly prohibited from setting on existing teams. Affected versions span the 10.11.x, 11.5.x, and 11.6.x release trains up to their respective latest builds. No public exploit identified at time of analysis, and the flaw has not been listed in CISA KEV.
Remote cluster authentication token disclosure in Mattermost's Secure Connections feature allows authenticated users holding the manage_secure_connections permission to retrieve plaintext inter-cluster credentials via a crafted PATCH request. Affected deployments span versions 10.11.x through 10.11.15, 11.5.x through 11.5.4, and 11.6.x through 11.6.1, with a CVSS-rated High confidentiality impact (6.5). No public exploit has been identified at time of analysis and the vulnerability is not listed in CISA KEV, but successful exploitation could undermine the trust model of federated multi-cluster deployments.
Mattermost's WebSocket layer improperly broadcasts `role_updated` events to all authenticated connections regardless of team or channel membership, enabling guest-level authenticated users to observe permission scheme change notifications for private teams they do not belong to. Affected versions span the 10.11.x, 11.5.x, and 11.6.x release lines. No public exploit code exists and this vulnerability is not listed in the CISA KEV catalog, but the low attack complexity and broad version impact make patching a straightforward priority for any Mattermost deployment with guest accounts enabled.
Server process termination in Mattermost is achievable by any authenticated user via a crafted outgoing webhook callback response that contains a null attachment entry - exploiting the server's failure to filter nil elements from attachment payloads before processing (CWE-754). Affected release trains span 10.11.x through 11.6.x, covering a wide installed base. No public exploit exists and EPSS is extremely low at 0.04% (12th percentile), but the availability impact is rated High by CVSS and the attack requires only low-privilege authentication over the network with no user interaction, making this a meaningful insider or compromised-account threat capable of triggering a full service outage.
Improper output escaping in NousResearch Hermes Agent versions up to 2026.4.16 allows remote unauthenticated attackers to manipulate message formatting in Slack and Mattermost integrations, potentially leading to information disclosure and service disruption. The vulnerability is exploitable via crafted format_message arguments with low attack complexity and requires no user interaction. Public exploit code is available via GitHub Gist. The vendor did not respond to early disclosure attempts, and no patch availability is documented.
OAuth scope validation bypass in Mattermost's GitHub integration allows authenticated users to escalate repository access beyond what was originally authorized. By manipulating the scope parameter in the GitHub OAuth authorization URL before the callback is processed, a low-privileged Mattermost user can obtain a GitHub token with broader permissions - including access to private repositories - than the application intended to grant. Affecting versions across four active release branches (10.11.x through 11.6.x), this is no public exploit identified at time of analysis and is not listed in CISA KEV, but the low complexity and authentication-only barrier make it a realistic insider or compromised-account risk.
Server crash via race condition in Mattermost's persistent notification and channel archival subsystem allows any low-privileged authenticated user to bring down the server with no user interaction required. Affected branches span 10.11.x through 11.6.x across multiple maintenance lines. No public exploit code has been identified at time of analysis and the vulnerability is absent from CISA KEV, but the low authentication bar combined with network accessibility and low attack complexity makes this a credible insider threat or targeted denial-of-service vector against any exposed Mattermost deployment.
Authenticated denial-of-service in Mattermost's plugin subsystem allows a low-privileged user to crash the plugin process by sending a crafted HTTP request to the PR details API endpoint. Affected across four active release branches (10.11.x, 11.4.x, 11.5.x, 11.6.x), the flaw stems from missing input validation in API request handlers (CWE-1287). No public exploit code exists and the vulnerability is not listed in CISA KEV; however, the low authentication barrier (any valid account) combined with network accessibility makes it a realistic insider or post-compromise nuisance risk.
Team member role data leaks from Mattermost's API across multiple actively maintained release branches due to missing sanitization of response payloads for low-privilege callers. Any authenticated user - regardless of their team role - can invoke standard team API endpoints and receive unsanitized member objects that expose role designations such as admin or system_admin. The vulnerability spans 10.11.x through 11.6.x, has no public exploit code, and is not listed in CISA KEV, but the low attack complexity and broad version coverage make it a meaningful reconnaissance risk in enterprise or multi-tenant deployments.
Uncontrolled memory allocation in Mattermost's TIFF image processing allows authenticated users to trigger server-side out-of-memory (OOM) conditions, effectively taking down the collaboration platform. Affected are all Mattermost deployments running versions 10.11.x through 11.6.0. Any account holding file upload or URL-posting permissions can exploit this remotely without elevated privileges, making it a realistic insider or compromised-account threat. No public exploit code or CISA KEV listing has been identified at time of analysis, but the low attack complexity and broad authentication base increase practical risk.
SSRF protection bypass in NocoDB's notification webhook plugins (Slack, Discord, Mattermost, Teams) allows authenticated Editor-level users to issue outbound POST requests to arbitrary internal hosts, including cloud-metadata endpoints. The root cause is a misplaced axios argument: `httpAgent`/`httpsAgent` were serialized into the request body instead of being passed as axios connection config, rendering the `request-filtering-agent` SSRF guard entirely ineffective across all four plugins. No public exploit has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.
SSO authentication callback origin validation failure in Mattermost Mobile Apps enables cross-server credential theft across multiple release branches (≤11.1.3, ≤11.3.2, ≤11.0.4, ≤10.11.11, ≤2.0.37). An attacker operating a malicious Mattermost server can relay the SSO authorization code exchange through a victim's mobile application to authenticate against a separate, legitimate Mattermost server - stealing valid session credentials without the victim's awareness. No public exploit has been identified at time of analysis, and CVSS AC:H constrains this to targeted, engineered attacks rather than opportunistic mass exploitation.
Incorrect authorization in Mattermost Playbooks (versions 11.5.0-11.5.1) allows any authenticated team member to create playbook runs in teams where they hold no run_create permission, by supplying an arbitrary team ID in the run creation API request. The server validates permissions only against the user's originating context rather than the target team specified in the payload, a classic authorization bypass rooted in CWE-863. No active exploitation has been confirmed (not in CISA KEV) and no public exploit code is identified at time of analysis, but the low attack complexity makes this trivially exploitable by any authenticated insider or compromised account.
Mattermost Desktop App can be repeatedly crashed by malicious server administrators through JavaScript URL injection in pop-up windows. Attackers controlling a Mattermost server can force connected desktop clients to become unusable by exploiting improper URL validation, requiring user interaction (connecting to the malicious server). No public exploit code identified at time of analysis, though the attack method is trivial to implement given the disclosed details.
Mattermost Desktop App can be crashed remotely by malicious server administrators or plugin developers exploiting insufficient isolation of server-rendered content. Authenticated attackers with low-privilege server access who can control rendered content (via compromised server, malicious plugin, or modified server responses) can invoke window.close() to terminate the desktop client, causing a client-side denial of service. EPSS data not available; no public exploit code identified at time of analysis. CVSS 3.5 (Low severity) reflects limited impact scope - disruption to individual user sessions rather than system-wide compromise.
Server-Side Request Forgery in Mattermost 10.11.x through 11.5.1 allows authenticated attackers with slash command access to redirect custom slash command responses to attacker-controlled servers by manipulating the Host header. The vulnerability requires low-privileged authentication and high attack complexity (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N), resulting in a CVSS score of 3.5. No public exploit code or active exploitation via CISA KEV has been identified at time of analysis. Vendor advisory available at mattermost.com/security-updates provides remediation guidance.
Password disclosure in Mattermost Server versions 11.5.0-11.5.1, 10.11.0-10.11.13, and 11.4.0-11.4.3 allows high-privilege administrators to view newly created user credentials, enabling impersonation attacks. The CVSS score of 6.5 reflects medium severity, requiring high-privilege access (PR:H) but offering network-based exploitation (AV:N) with low complexity (AC:L). While not currently listed in CISA KEV and no public exploit identified at time of analysis, the vendor-confirmed vulnerability (Mattermost Advisory MMSA-2026-00614) presents real risk in environments where privileged accounts are compromised or insider threats exist.
Authenticated team members with 'Manage Own Slash Commands' permission can hijack existing slash commands in Mattermost 11.5.x through 11.5.1, 10.11.x through 10.11.13, and 11.4.x through 11.4.3 by editing their own command triggers to match already-registered system or custom commands. This privilege escalation flaw (CWE-863: Incorrect Authorization) enables command impersonation, allowing attackers to intercept and potentially manipulate user interactions with legitimate slash commands. With CVSS 4.3 (low-medium severity) and EPSS data unavailable, real-world risk depends heavily on organizational use of slash commands for sensitive operations. No public exploit identified at time of analysis, and the attack requires authenticated access with specific permissions, limiting immediate exposure compared to unauthenticated network vulnerabilities.
Unauthorized access to public playbooks in Mattermost 10.11.x through 11.5.x allows authenticated users without proper permissions to retrieve public playbooks via the /get endpoint. The vulnerability affects all versions from 10.11.0 through 10.11.13, 11.4.0 through 11.4.3, and 11.5.0 through 11.5.1 due to missing public/private permission validation. With CVSS 4.3 (Medium) and requiring authenticated access (PR:L), this represents a privilege escalation issue allowing disclosure of potentially sensitive playbook configurations, but is limited to low confidentiality impact without integrity or availability compromise. No active exploitation confirmed (not in CISA KEV) and EPSS data not provided.
Authenticated Mattermost users can read private channel threads and direct messages they lack access to by exploiting the AI post rewrite endpoint. Versions 11.5.0 and 11.5.1 fail to verify channel membership before processing AI-assisted message rewrites, enabling privilege escalation from low-privileged authenticated users to access confidential communications. CVSS 6.5 reflects network-accessible attack with low complexity requiring only basic authentication. EPSS data not available; no public exploit or KEV listing identified at time of analysis.
Authenticated users in Mattermost Plugins can disrupt Gitlab integration by uninstalling instances or modifying webhook connections without proper authorization. The CWE-862 authorization flaw in versions <=11.5, 11.1.5, 10.13.11, and 11.3.4.0 allows users with low-level privileges (PR:L) to execute administrative commands via `/gitlab instance {option}` or `/gitlab webhook {option}`, resulting in availability impact (A:H) to the Gitlab plugin infrastructure. CVSS 6.5 reflects moderate risk, with EPSS data and active exploitation status not available at time of analysis.
Authorization bypass in Mattermost 10.11.x through 10.11.13 and 11.5.x through 11.5.1 allows authenticated users with 'Manage Playbook Configurations' permission to reassign playbooks to arbitrary teams via PUT API, circumventing team membership restrictions. This access control flaw enables lateral privilege escalation across team boundaries without proper authorization checks. EPSS exploitation probability data not available; no confirmed active exploitation (CISA KEV) or public exploit code identified at time of analysis.
Authenticated Mattermost channel members can forcibly reveal burn-on-read messages without recipient consent by exploiting missing X-Requested-With header validation on the reveal endpoint through crafted Markdown image tags. This bypasses the intended ephemeral messaging security control in Mattermost versions 11.4.x through 11.4.3 and 11.5.x through 11.5.1. The CVSS vector indicates network-accessible exploitation by low-privileged authenticated users with low attack complexity. Exploitation status: no public exploit identified at time of analysis. EPSS data not provided.
Memory exhaustion denial of service in Mattermost Server versions 11.5.x through 11.5.1, 10.11.x through 10.11.13, and 11.4.x through 11.4.3 allows authenticated attackers to crash the server by uploading maliciously crafted 7zip archives containing excessive folder declarations. The vulnerability stems from insufficient validation of 7zip archive structure before decompression, enabling resource exhaustion attacks with low attack complexity. EPSS data not available, not listed in CISA KEV, indicating no confirmed widespread exploitation at time of analysis.
Mattermost Plugins through version 11.5 allow authenticated users to bypass group-level access controls and create issues or attach comments to locked groups they should not access. Attackers holding membership in multiple groups can exploit missing API-level authorization checks via direct API requests to write data into restricted groups, violating intended access boundaries. EPSS risk data not available; CVSS 4.3 reflects low-privilege authenticated network attack with low complexity. No active exploitation confirmed by CISA KEV at time of analysis, though vendor advisory (MMSA-2026-00602) confirms the vulnerability.
Authorization bypass in Mattermost Plugins allows authenticated users to subscribe to unauthorized notification groups by exploiting prefix-matching namespace validation. Affected versions (≤11.5, 11.1.5, 10.13.11, 11.3.4.0) fail to enforce group whitelisting, enabling low-privileged plugin users to create groups sharing prefixes with authorized groups and thereby receive notifications or access information from out-of-scope channels. EPSS data unavailable; not listed in CISA KEV; CVSS 4.3 reflects low-privilege network exploitation with limited integrity impact but no confidentiality or availability compromise.
Cross-site scripting (XSS) in Mattermost Server 10.11.0-10.11.13 and 11.5.0-11.5.1 enables authenticated administrators to inject JavaScript code through unescaped variables in error page templates. Exploitation requires high-privilege (PR:H) administrative access to site configuration settings, limiting real-world risk despite network-based attack vector (AV:N). No active exploitation confirmed (not in CISA KEV). EPSS data not available for recent CVE. This is a stored XSS vulnerability affecting administrative workflows rather than end users.
Authenticated attackers can bypass token rotation in Mattermost's remote cluster invite confirmation process by reusing original invite tokens. The flaw affects Mattermost Server versions 11.5.x through 11.5.1 and 10.11.x through 10.11.13, allowing token reuse despite intended security controls. While rated low severity (CVSS 3.7), this represents an authentication bypass vulnerability (CWE-863) that undermines session management security. No active exploitation confirmed (not in CISA KEV), and no public exploit code identified at time of analysis.
Privilege escalation in Mattermost Server allows authenticated users with revoked channel posting permissions to continue modifying their existing posts. Affected versions include 11.5.0-11.5.1, 10.11.0-10.11.13, and 11.4.0-11.4.3. Attackers bypass authorization controls by sending direct API requests to post update and patch endpoints, circumventing permission checks that should prevent post edits after privileges are revoked. EPSS data not available; no confirmed active exploitation or public POC identified at time of analysis. CVSS 4.3 (Medium) reflects low integrity impact limited to existing content modification.
Resource exhaustion in Mattermost Server 10.11.x through 11.5.1 allows authenticated users to trigger denial of service by sending oversized HTTP POST requests to the /api/v1/meetings endpoint. The vulnerability affects three active release branches with no request size validation on the meeting start API. EPSS data not available; no confirmed active exploitation (not in CISA KEV); authentication requirement (PR:L) reduces immediate exposure to internal or compromised users. Vendor advisory MMSA-2026-00608 confirms the issue.
Authorization bypass in Mattermost shared channel synchronization allows authenticated remote cluster administrators to remove arbitrary users from any channel, including private channels outside the attacker's authorization scope. Affects versions 11.5.x through 11.5.1, 10.11.x through 10.11.13, and 11.4.x through 11.4.3. CVSS 4.3 reflects the low-privilege requirement (authenticated remote cluster) and limited impact scope (integrity only, no data exposure), though cross-tenant authorization violations in collaboration platforms warrant attention. EPSS data unavailable; no public exploit identified at time of analysis; not listed in CISA KEV.
OAuth authorization code interception in Mattermost 10.11.x through 10.11.13 and 11.5.x through 11.5.1 allows authenticated OAuth clients to redeem authorization codes issued to different clients. An attacker controlling a malicious OAuth application can intercept and exchange authorization codes meant for legitimate applications, potentially gaining unauthorized access to user data or sessions. CVSS score of 3.1 reflects high attack complexity and required privileges, with EPSS data not provided. Vendor patch released per Mattermost advisory MMSA-2026-00570.
Authenticated users in Mattermost 11.5.x through 11.5.1 and 10.11.x through 10.11.13 can modify post attachments, properties, and pin status beyond the configured edit time window. The vulnerability bypasses the PostEditTimeLimit control via patch and update API endpoints, allowing indefinite modification of non-message post metadata after the intended edit window expires. CVSS 3.1 (Low) reflects network vector with high complexity and low-privilege requirements, while no public exploit or CISA KEV listing exists at time of analysis.
Client-side denial-of-service in Mattermost allows remote attackers to crash user browsers via maliciously crafted SVG files embedded in OpenGraph metadata or Markdown images. The vulnerability affects Mattermost Server versions 11.5.0-11.5.1, 10.11.0-10.11.13, and 11.4.0-11.4.3, where the server fails to validate proxied image response bodies. Attackers exploit this by serving SVG files with misleading Content-Type headers (e.g., image/png) that bypass validation, causing resource exhaustion when rendered in victim browsers. CVSS rates this 4.3 (Medium) with network attack vector requiring user interaction, while EPSS data is not available. No evidence of active exploitation (not in CISA KEV) or public exploit code at time of analysis.
OpenClaw before 2026.4.22 allows workspace dotenv files to override connector endpoint hosts for Matrix, Mattermost, IRC, and Synology connectors, enabling local attackers with workspace access to redirect runtime traffic to malicious endpoints. The vulnerability requires local access and user interaction but allows high confidentiality impact through traffic interception. No active exploitation has been identified, but a vendor-released patch is available.
Mattermost versions 10.11.x through 10.11.12, 11.3.x through 11.3.2, 11.4.x through 11.4.2, and 11.5.0 fail to enforce atomic consumption of guest magic link tokens, allowing unauthenticated attackers to establish multiple concurrent authenticated sessions from a single valid magic link. This enables unauthorized access and potential information disclosure without requiring additional credentials or user interaction beyond intercepting or obtaining the link.
Mattermost versions 10.11.x through 10.11.12, 11.3.x through 11.3.2, 11.4.x through 11.4.2, and 11.5.0 fail to validate CSRF tokens on authentication endpoints, allowing remote attackers to update a targeted user's authentication method by tricking them into visiting a malicious page. The attack requires user interaction (UI:R) and results in high confidentiality and integrity impact, but no public exploit or CISA KEV confirmation has been identified at the time of analysis.
Mattermost versions 10.11.0 through 10.11.12 fail to validate workspace ownership during Connected Workspaces API interactions, allowing a malicious remote server with high privileges to modify the displayed status of local users. This affects organizations using the Connected Workspaces federation feature and requires an attacker to already possess high administrative privileges on a connected remote instance. The vulnerability has CVSS 2.7 (low severity) and no public exploit code or active exploitation has been identified.
Mattermost Plugins versions 2.1.3.0 and earlier allow remote attackers without authentication to cause denial of service through memory exhaustion by sending oversized JSON payloads to the /changes webhook endpoint. The vulnerability stems from a lack of request body size validation, enabling attackers to exhaust server memory and crash the service. CVSS is 3.7 (low severity) with low exploitability complexity, and no public exploit or active exploitation has been confirmed.
Mattermost Plugins versions 2.3.1 and earlier allow unauthenticated remote attackers to trigger denial of service by sending oversized JSON payloads to the /lifecycle webhook endpoint, causing memory exhaustion due to missing request body size validation. CVSS 3.7 reflects low severity despite network accessibility; EPSS and active exploitation status not independently confirmed from available data.
Focalboard 8.0 fails to validate file ownership during file serving, allowing authenticated attackers to read arbitrary uploaded files if they know the target fileID. The vulnerability affects all versions of the standalone Focalboard product, which is no longer maintained by Mattermost and will not receive security patches. An attacker with valid credentials can exploit this authorization bypass with no additional user interaction to access sensitive file contents.
Second-order SQL injection in Focalboard 8.0 and earlier allows authenticated attackers to exfiltrate password hashes and other sensitive data via time-based blind injection through the category reorder API. Malicious SQL payloads injected into category ID fields persist in the database and execute unsanitized during subsequent reorder operations. Focalboard standalone is unsupported and will not receive a security patch. EPSS score of 0.01% indicates very low observed exploitation probability, consistent with the narrow attack surface requiring authenticated access to an end-of-life product.
Mattermost Advanced Logging configuration fails to properly validate file target paths, allowing authenticated system administrators to read arbitrary files from the host system during support packet generation. The vulnerability affects Mattermost versions 11.4.0 and earlier in the 11.4.x line, 11.3.1 and earlier in the 11.3.x line, 11.2.3 and earlier in the 11.2.x line, and 10.11.11 and earlier in the 10.11.x line. An authenticated administrator with access to Advanced Logging JSON configuration can craft a malicious configuration to traverse the filesystem and extract sensitive host files through the support packet mechanism. No public exploit code has been identified at time of analysis, though exploitation requires administrative privileges and is not automatable according to CISA SSVC assessment.
Mattermost Plugins versions 11.4 and earlier, including 10.11.11.0, fail to validate webhook request timestamps, enabling attackers with high privileges to replay webhook requests and corrupt Zoom meeting state within Mattermost deployments. The vulnerability carries a CVSS score of 2.2 with low attack complexity but requires high-privilege authentication; no public exploit has been identified at time of analysis, and CISA has not flagged this for active exploitation.
Mattermost versions 11.2.x through 11.4.x fail to enforce view restrictions on group member endpoints, allowing authenticated guest users to enumerate user IDs beyond their authorized visibility scope. This authorization bypass requires valid credentials but enables attackers to discover internal user information through the group retrieval API. No patch is currently available for affected versions.
Mattermost server versions 10.11.x through 11.4.x fail to validate decompressed archive entry sizes during ZIP file extraction, allowing authenticated users with file upload permissions to trigger denial of service by uploading crafted zip bombs that exhaust server memory. The vulnerability affects Mattermost 10.11.0-10.11.11, 11.2.0-11.2.3, 11.3.0-11.3.1, and 11.4.0, with CVSS 6.5 (medium) reflecting the requirement for prior authentication and limited scope (availability impact only). No public exploit identified at time of analysis, though the attack vector is network-accessible and requires low complexity once an attacker has valid upload credentials.
Mattermost Plugins versions 11.4 and earlier fail to validate incoming request sizes on webhook endpoints, allowing authenticated attackers to trigger denial of service by sending oversized requests. The vulnerability affects multiple Mattermost release branches (10.x, 11.0.x, 11.1.x, 11.3.x) and has been assigned CVSS 4.9 (medium severity) with no public exploit identified at time of analysis. While exploitability requires high-privilege authentication and manual intervention, the lack of request size enforcement on webhooks represents a fundamental input validation gap that could disrupt service availability in production environments.
Mattermost bulk export functionality fails to apply proper file permissions, allowing unprivileged local users on affected servers to read sensitive exported data. Mattermost versions 11.4.0, 11.3.x through 11.3.1, 11.2.x through 11.2.3, and 10.11.x through 10.11.11 are vulnerable (CVE-2026-3113, MMSA-2026-00593). An authenticated local attacker with login credentials can access bulk export files created by other users, leading to unauthorized information disclosure of potentially sensitive team and channel communications. No public exploit code has been identified at time of analysis, and CISA has not listed this in the Known Exploited Vulnerabilities catalog, though the vulnerability's automatable nature and low attack complexity warrant prompt patching.
Mattermost versions 11.2.x through 11.2.2, 10.11.x through 10.11.10, 11.4.0, and 11.3.x through 11.3.1 fail to properly restrict team-level access during remote cluster membership synchronization, allowing a malicious remote cluster to grant users access to entire private teams rather than limiting access to only shared channels. An authenticated attacker controlling a federated remote cluster can send crafted membership sync messages to trigger unintended team membership assignment, resulting in unauthorized access to private team resources. The EPSS score of 0.03% (percentile 7%) indicates low real-world exploitation probability, and no public exploit code has been identified at time of analysis.
A Cross-Site Request Forgery (CSRF) vulnerability exists in Mattermost's access control policy activation endpoint due to improper CSRF token validation. Authenticated attackers can exploit this to trick administrators into activating or deactivating access control policies via crafted requests, potentially altering security posture. The vulnerability affects Mattermost versions 10.11.x through 10.11.10, 11.2.x through 11.2.2, 11.3.x through 11.3.1, and 11.4.0. No public exploitation or active KEV status has been reported, though the CISA SSVC framework indicates no current exploitation evidence and non-automatable attack requirements, limiting immediate real-world threat severity.
Mattermost fails to properly sanitize external SVG rendering in link embeds, allowing unauthenticated users to trigger denial-of-service conditions in both web and desktop applications. An attacker can create a malicious GitHub issue or pull request containing a crafted external SVG that crashes the Mattermost webapp and desktop client when the link is embedded. This vulnerability affects Mattermost versions 11.4.0 and below, 11.3.1 and below, 11.2.3 and below, and 10.11.11 and below, with a CVSS score of 4.3 indicating low-to-moderate severity focused on availability impact rather than confidentiality or integrity.
Mattermost fails to properly validate user identity in OpenID Connect authentication logic due to an overly permissive substring matching flaw in the IsSameUser() comparison function, allowing attackers with high privileges to take over arbitrary user accounts through the user discovery flow. This affects Mattermost versions 10.11.0-10.11.11, 11.2.0-11.2.3, 11.3.0-11.3.1, and 11.4.0. While the CVSS score of 5.7 is moderate and requires high privilege access and user interaction, the core impact is account takeover with full account compromise possible.
Mattermost versions 11.4.0, 11.3.x through 11.3.1, 11.2.x through 11.2.3, and 10.11.x through 10.11.11 lack proper rate limiting on login endpoints, allowing unauthenticated attackers to trigger denial of service through HTTP/2 single packet attacks delivering 100+ parallel login requests. This causes server crashes and forced restarts. While the CVSS score of 4.3 is moderate and requires low attack complexity over the network, the vulnerability enables complete service disruption without authentication.
Mattermost 10.11.x through 10.11.10 fails to clear cached permalink preview data when a user's channel access is revoked, allowing authenticated users to view private channel content through previously cached previews until the cache expires or they re-login. An authenticated attacker who previously had access to a private channel can exploit this to maintain visibility into sensitive channel communications after access removal. A patch is not currently available for this medium-severity vulnerability.
Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role.
Mattermost versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier contain an array length handling vulnerability in the calls plugin that allows unauthenticated remote attackers to trigger out-of-memory (OOM) errors and crash the server by sending maliciously crafted msgpack frames over websocket connections. With a CVSS score of 5.8 and network-based attack vector requiring no privileges or user interaction, this denial-of-service vulnerability poses a moderate but easily exploitable availability risk to any exposed Mattermost deployment.
Mattermost versions 11.3.0 and 11.2.2 and earlier fail to properly validate the run_create permission when a playbook ID is empty, allowing authenticated team members to create unauthorized playbook runs through the API. This permission bypass could enable attackers with valid credentials to perform actions they should not be permitted to execute within the platform.
Mattermost Server versions 11.3.0, 11.2.x through 11.2.2, and 10.11.x through 10.11.10 contain a server-side request forgery (SSRF) vulnerability due to improper validation of IPv4-mapped IPv6 addresses, allowing authenticated attackers to bypass reserved IP restrictions and access internal services. An attacker with login credentials can craft requests using IPv6 notation (such as [::ffff:127.0.0.1]) to reach localhost or other restricted internal endpoints that would normally be blocked. No patch is currently available for this vulnerability.
A remote code execution vulnerability (CVSS 4.3) that allows guest users without read permissions. Remediation should follow standard vulnerability management procedures.
CVE-2026-22545 is a security vulnerability (CVSS 3.1) that allows an authenticated attacker. Remediation should follow standard vulnerability management procedures.
CVE-2026-21386 is a security vulnerability (CVSS 4.3) that allows an authenticated team member. Remediation should follow standard vulnerability management procedures.
Mattermost versions 11.3.0, 11.2.2, and 10.11.10 and earlier lack proper memory bounds checking when processing DOC file uploads, enabling authenticated attackers to trigger server memory exhaustion and denial of service. An attacker with valid credentials can upload a specially crafted DOC file to exhaust available memory and crash the Mattermost server. This vulnerability currently lacks a patch and affects multiple active versions of the platform.
This vulnerability in Mattermost allows guest users to bypass team-specific file upload permissions through a cross-team file metadata reuse attack. Affected versions include Mattermost 11.3.0, 11.2.x up to 11.2.2, and 10.11.x up to 10.11.10. An authenticated guest user can upload a file in a team where they have upload_file permission, then reuse that file's metadata in POST requests to channels in different teams where they lack upload permission, resulting in unauthorized file posting with potential integrity impact.
Mattermost fails to properly validate User-Agent header tokens in versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier, allowing authenticated attackers to trigger request panics through specially crafted User-Agent headers. This denial-of-service vulnerability affects availability but requires prior authentication and results in only low-severity impact. While the CVSS score of 4.3 reflects the low severity, the practical risk depends on whether the application is exposed to untrusted authenticated users and whether automatic exploitation tools are readily available.
This vulnerability in Mattermost allows unauthenticated attackers to achieve remote code execution and exfiltrate sensitive credentials through malicious plugin installation on CI test instances that retain default admin credentials. Affected versions include Mattermost 10.11.x through 10.11.10, 11.2.x through 11.2.2, and 11.3.0, with the core issue stemming from insufficient access controls on plugin installation combined with default credential exposure. An attacker can upload a malicious plugin after modifying the import directory to gain full system compromise and access AWS and SMTP credentials stored in configuration files.
Mattermost versions 11.3.x up to and including 11.3.0 contain an information disclosure vulnerability where burn-on-read posts fail to maintain their redacted state when deleted, allowing authenticated channel members to view previously hidden message contents through WebSocket post deletion events. The vulnerability requires low-privilege authenticated access and results in confidentiality loss of sensitive communications that were intentionally designed to be self-destructing. With a CVSS score of 4.3 and network-based attack vector, this represents a meaningful but contained risk primarily affecting organizations relying on Mattermost's burn-on-read feature for secure internal communications.
Mattermost fails to properly bound memory allocation when processing PSD (Photoshop) image files, allowing authenticated attackers to exhaust server memory and trigger denial of service by uploading a specially crafted PSD file. The vulnerability affects Mattermost versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier. With a CVSS score of 4.3 and a low attack complexity requirement, this represents a moderate but exploitable risk for organizations running affected versions where user file upload is permitted.
This vulnerability is an improper access control flaw in Mattermost's channel search functionality that allows removed team members to enumerate all public channels within private teams. Affected versions include Mattermost 11.3.x through 11.3.0, 11.2.x through 11.2.2, and 10.11.x through 10.11.10. An authenticated attacker who has been removed from a team can query the channel search API endpoint to discover the complete list of public channels in that private team, resulting in information disclosure without requiring elevated privileges.
Mattermost fails to properly sanitize client-supplied post metadata in its post update API endpoint, allowing authenticated attackers to spoof permalink embeds and impersonate other users through crafted PUT requests. The vulnerability affects Mattermost versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier. While the CVSS score of 4.3 is moderate and requires authentication, the integrity impact allows attackers to deceive users by falsely attributing messages to legitimate users, potentially facilitating social engineering or misinformation campaigns within Mattermost instances.
Mattermost Plugins versions 11.3 and earlier fail to implement proper authorization checks on comment block modifications, allowing authenticated users with editor permissions to modify comments created by other board members without restriction. An authorized attacker can alter or tamper with comments from colleagues, potentially modifying project records, discussions, or audit trails. With a CVSS score of 4.3 and low attack complexity, this represents a moderate integrity risk in collaborative environments where comment authenticity is important, though exploitation requires prior authentication and editor-level access.
Mattermost fails to properly validate user permissions when filtering invite IDs during team creation, allowing authenticated users to bypass access controls and register unauthorized accounts using leaked or discovered invite tokens. Affected versions include Mattermost 11.3.0 and earlier in the 11.3.x branch, 11.2.2 and earlier in the 11.2.x branch, and 10.11.10 and earlier in the 10.11.x branch. An authenticated attacker with knowledge of valid invite IDs can circumvent intended access restrictions to create accounts that should be restricted, resulting in unauthorized account registration and potential lateral movement within the Mattermost instance.
Mattermost fails to enforce response size limits on integration action endpoints, allowing an authenticated attacker to trigger server memory exhaustion and denial of service by clicking an interactive message button that connects to a malicious integration server returning arbitrarily large responses. This vulnerability affects Mattermost versions 11.3.0, 11.2.x up to 11.2.2, and 10.11.x up to 10.11.10. While the CVSS score of 5.3 is moderate, the attack requires user interaction (UI:R) and network access, but can be reliably triggered by any authenticated user interacting with crafted messages.
Mattermost Desktop is affected by inclusion of functionality from untrusted control sphere (CVSS 4.6).
Arbitrary code execution in Mattermost Desktop App through version 6.2.0 results from insufficient validation of help menu links, enabling a malicious server administrator to execute arbitrary executables on affected users' systems when they click specially crafted help items. This vulnerability affects multiple versions including 5.2.13.0 and 6.0, requiring user interaction and authenticated server access to exploit. No patch is currently available for this HIGH severity vulnerability.
Mattermost versions 10.11.x <= 10.11.9 fail to enforce invite permissions when updating team settings, which allows team administrators without proper permissions to bypass restrictions and add users to their team via API requests. Mattermost Advisory ID: MMSA-2025-00561 [CVSS 3.8 LOW]
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. [CVSS 4.3 MEDIUM]
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. [CVSS 5.7 MEDIUM]
Mattermost Server versions 11.1.x through 11.1.2, 10.11.x through 10.11.9, and 11.2.x through 11.2.1 inadequately enforce login method restrictions, permitting authenticated users to circumvent SSO-only requirements by authenticating with a userID instead. This allows an attacker with valid credentials to gain unauthorized access to accounts restricted to single sign-on authentication. No patch is currently available for this vulnerability.
Insufficient identity validation in Mattermost Server (versions 11.1.x through 11.2.1 and earlier) and Zoom Plugin (versions up to 1.11.0) allows authenticated users to initiate Zoom meetings as arbitrary users and modify other users' posts through direct API manipulation. An attacker with valid credentials can exploit the /api/v1/askPMI endpoint to impersonate other users and alter post content without proper authorization checks. The vulnerability affects multiple Mattermost and plugin versions with no patch currently available.
Mattermost and Zoom plugin versions fail to properly authenticate users before allowing modifications to Zoom meeting restrictions, enabling any logged-in user to alter meeting settings across arbitrary channels. Affected versions include Mattermost 11.1.x through 11.1.2, 10.11.x through 10.11.9, 11.2.x through 11.2.1, and Zoom plugin versions up to 1.11.0. No patch is currently available for this privilege escalation vulnerability.
Mattermost versions 11.1.2, 10.11.9, and 11.2.1 and earlier fail to properly enforce access controls in the Jira plugin's /create-issue API endpoint, allowing authenticated users to read restricted post content and attachments from channels they cannot access by referencing post IDs. An attacker with Jira plugin access can exploit this to enumerate and exfiltrate sensitive information from private or restricted channels. No patch is currently available for affected versions.
Incorrect authorization in Mattermost's demote-user API allows a lower-privileged administrator to degrade arbitrary bot accounts to guest status, affecting versions 11.7.0 and 10.11.17 and earlier. The root cause is missing validation of whether the target of a demotion operation is a bot account, meaning an admin who lacks full system privileges can still weaponize the standard API endpoint against bot identities. No public exploit exists and the vulnerability is not listed in CISA KEV; its real-world priority is low given the high-privilege requirement and limited blast radius.
Subscription hijacking in Mattermost allows authenticated low-privileged users to take control of subscriptions belonging to channels they have no access to by submitting a crafted PUT request to the subscription edit endpoint. The root cause is a missing channel ownership validation check, classified as an Insecure Direct Object Reference (CWE-639), affecting versions across four active release branches (10.11.x, 11.5.x, 11.6.x, 11.7.x). No public exploit has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.
Missing authentication on the Atlassian Connect install callback in Mattermost allows a remote attacker to inject a rogue sharedSecret into an in-progress Jira integration setup. Affected versions span the 10.11.x, 11.5.x, 11.6.x, and 11.7.x release trains, all of which expose the POST /ac/installed endpoint without validating the caller's identity during the pending-install window. No public exploit has been identified at time of analysis, but a successful injection corrupts the integration's trust handshake, yielding high integrity and availability impact against the Jira connection. The vendor CVSS vector assigns PR:L, which conflicts with the description's 'remote unauthenticated attacker' language - this discrepancy warrants direct verification with Mattermost advisory MMSA-2026-00654.
Insufficient authorization checks on the bot deactivation endpoint in Mattermost 11.7.x <= 11.7.0 and 10.11.x <= 10.11.17 permit a User Manager with write access to user management but without Integrations permissions to deactivate bot accounts via the PUT /api/v4/users/{id}/active API. An attacker with high privileges can disable bots, impacting availability and integrity of automated services. No known active exploitation or public exploit code is reported.
WebSocket session persistence in Mattermost allows authenticated users whose sessions have been globally revoked to bypass that revocation and continue receiving real-time platform events. Affected across four actively maintained release branches (11.7.x, 11.6.x, 11.5.x, 10.11.x), the flaw directly undermines the effectiveness of administrative session revocation - a control relied upon in account-compromise response and offboarding workflows. No public exploit code exists and no active exploitation has been confirmed (not in CISA KEV); the EPSS signal is absent from available data, and the vendor-assigned CVSS of 4.3 reflects correctly scoped, medium-severity risk.
The /gitlab connect slash command in Mattermost fails to enforce administrator-level authorization on the setDefaultInstance call, enabling any authenticated user to overwrite the workspace-wide default GitLab instance configuration. Affected across four concurrent release trains (11.7.0, 11.6.x ≤ 11.6.2, 11.5.x ≤ 11.5.5, 10.11.x ≤ 10.11.17), this missing authorization flaw (CWE-862) is exploitable by any valid Mattermost account holder without elevated privileges. No public exploit code or active exploitation has been identified at time of analysis, but the low attack complexity and low privilege requirement make this accessible to any workspace member targeting GitLab integration infrastructure.
Denial of service in Mattermost Desktop App (versions ≤6.1 and ≤5.5.13.0) allows a malicious Mattermost server owner to crash client applications by injecting a script that calls window.open() with an excessively large URL, exploiting a missing resource limit on URL length processing. Exploitation requires user interaction - the victim must actively connect their Desktop App to an attacker-controlled server - and impact is strictly limited to application availability with no confidentiality or integrity exposure. No public exploit code has been identified and this vulnerability is not listed in the CISA KEV catalog at time of analysis.
Improper access control in OpenClaw's Mattermost event handler integration allows remote unauthenticated attackers to bypass direct message (DM) policy enforcement by submitting crafted Mattermost events that deliberately omit channel type metadata. All OpenClaw versions prior to 2026.5.6 are affected. No public exploit or active exploitation has been identified at time of analysis, but the network-accessible and unauthenticated nature of the flaw (PR:N per CVSS 4.0) makes it actionable for deployments that rely on DM policies as a meaningful access control boundary.
Private message interception in Mattermost affects versions 11.6.x through 11.6.1, 11.5.x through 11.5.4, and 10.11.x through 10.11.16, allowing a low-privileged attacker to receive plugin-generated direct messages intended for bot accounts. The flaw stems from the bot registration flow failing to verify that a claimed username actually belongs to a bot account, enabling an attacker who pre-registers a human account using a predictable plugin bot username to silently hijack those message channels. No public exploit code exists at time of analysis, and exploitation requires both an existing user account and advance knowledge of the target bot's username.
Mattermost's team creation API endpoint (POST /api/v4/teams) fails to enforce the PermissionInviteUser authorization check, allowing authenticated users holding only PermissionCreateTeam to configure invite-controlled team settings - including making a team publicly joinable via open invite and restricting membership by allowed domains - that they are explicitly prohibited from setting on existing teams. Affected versions span the 10.11.x, 11.5.x, and 11.6.x release trains up to their respective latest builds. No public exploit identified at time of analysis, and the flaw has not been listed in CISA KEV.
Remote cluster authentication token disclosure in Mattermost's Secure Connections feature allows authenticated users holding the manage_secure_connections permission to retrieve plaintext inter-cluster credentials via a crafted PATCH request. Affected deployments span versions 10.11.x through 10.11.15, 11.5.x through 11.5.4, and 11.6.x through 11.6.1, with a CVSS-rated High confidentiality impact (6.5). No public exploit has been identified at time of analysis and the vulnerability is not listed in CISA KEV, but successful exploitation could undermine the trust model of federated multi-cluster deployments.
Mattermost's WebSocket layer improperly broadcasts `role_updated` events to all authenticated connections regardless of team or channel membership, enabling guest-level authenticated users to observe permission scheme change notifications for private teams they do not belong to. Affected versions span the 10.11.x, 11.5.x, and 11.6.x release lines. No public exploit code exists and this vulnerability is not listed in the CISA KEV catalog, but the low attack complexity and broad version impact make patching a straightforward priority for any Mattermost deployment with guest accounts enabled.
Server process termination in Mattermost is achievable by any authenticated user via a crafted outgoing webhook callback response that contains a null attachment entry - exploiting the server's failure to filter nil elements from attachment payloads before processing (CWE-754). Affected release trains span 10.11.x through 11.6.x, covering a wide installed base. No public exploit exists and EPSS is extremely low at 0.04% (12th percentile), but the availability impact is rated High by CVSS and the attack requires only low-privilege authentication over the network with no user interaction, making this a meaningful insider or compromised-account threat capable of triggering a full service outage.
Improper output escaping in NousResearch Hermes Agent versions up to 2026.4.16 allows remote unauthenticated attackers to manipulate message formatting in Slack and Mattermost integrations, potentially leading to information disclosure and service disruption. The vulnerability is exploitable via crafted format_message arguments with low attack complexity and requires no user interaction. Public exploit code is available via GitHub Gist. The vendor did not respond to early disclosure attempts, and no patch availability is documented.
OAuth scope validation bypass in Mattermost's GitHub integration allows authenticated users to escalate repository access beyond what was originally authorized. By manipulating the scope parameter in the GitHub OAuth authorization URL before the callback is processed, a low-privileged Mattermost user can obtain a GitHub token with broader permissions - including access to private repositories - than the application intended to grant. Affecting versions across four active release branches (10.11.x through 11.6.x), this is no public exploit identified at time of analysis and is not listed in CISA KEV, but the low complexity and authentication-only barrier make it a realistic insider or compromised-account risk.
Server crash via race condition in Mattermost's persistent notification and channel archival subsystem allows any low-privileged authenticated user to bring down the server with no user interaction required. Affected branches span 10.11.x through 11.6.x across multiple maintenance lines. No public exploit code has been identified at time of analysis and the vulnerability is absent from CISA KEV, but the low authentication bar combined with network accessibility and low attack complexity makes this a credible insider threat or targeted denial-of-service vector against any exposed Mattermost deployment.
Authenticated denial-of-service in Mattermost's plugin subsystem allows a low-privileged user to crash the plugin process by sending a crafted HTTP request to the PR details API endpoint. Affected across four active release branches (10.11.x, 11.4.x, 11.5.x, 11.6.x), the flaw stems from missing input validation in API request handlers (CWE-1287). No public exploit code exists and the vulnerability is not listed in CISA KEV; however, the low authentication barrier (any valid account) combined with network accessibility makes it a realistic insider or post-compromise nuisance risk.
Team member role data leaks from Mattermost's API across multiple actively maintained release branches due to missing sanitization of response payloads for low-privilege callers. Any authenticated user - regardless of their team role - can invoke standard team API endpoints and receive unsanitized member objects that expose role designations such as admin or system_admin. The vulnerability spans 10.11.x through 11.6.x, has no public exploit code, and is not listed in CISA KEV, but the low attack complexity and broad version coverage make it a meaningful reconnaissance risk in enterprise or multi-tenant deployments.
Uncontrolled memory allocation in Mattermost's TIFF image processing allows authenticated users to trigger server-side out-of-memory (OOM) conditions, effectively taking down the collaboration platform. Affected are all Mattermost deployments running versions 10.11.x through 11.6.0. Any account holding file upload or URL-posting permissions can exploit this remotely without elevated privileges, making it a realistic insider or compromised-account threat. No public exploit code or CISA KEV listing has been identified at time of analysis, but the low attack complexity and broad authentication base increase practical risk.
SSRF protection bypass in NocoDB's notification webhook plugins (Slack, Discord, Mattermost, Teams) allows authenticated Editor-level users to issue outbound POST requests to arbitrary internal hosts, including cloud-metadata endpoints. The root cause is a misplaced axios argument: `httpAgent`/`httpsAgent` were serialized into the request body instead of being passed as axios connection config, rendering the `request-filtering-agent` SSRF guard entirely ineffective across all four plugins. No public exploit has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.
SSO authentication callback origin validation failure in Mattermost Mobile Apps enables cross-server credential theft across multiple release branches (≤11.1.3, ≤11.3.2, ≤11.0.4, ≤10.11.11, ≤2.0.37). An attacker operating a malicious Mattermost server can relay the SSO authorization code exchange through a victim's mobile application to authenticate against a separate, legitimate Mattermost server - stealing valid session credentials without the victim's awareness. No public exploit has been identified at time of analysis, and CVSS AC:H constrains this to targeted, engineered attacks rather than opportunistic mass exploitation.
Incorrect authorization in Mattermost Playbooks (versions 11.5.0-11.5.1) allows any authenticated team member to create playbook runs in teams where they hold no run_create permission, by supplying an arbitrary team ID in the run creation API request. The server validates permissions only against the user's originating context rather than the target team specified in the payload, a classic authorization bypass rooted in CWE-863. No active exploitation has been confirmed (not in CISA KEV) and no public exploit code is identified at time of analysis, but the low attack complexity makes this trivially exploitable by any authenticated insider or compromised account.
Mattermost Desktop App can be repeatedly crashed by malicious server administrators through JavaScript URL injection in pop-up windows. Attackers controlling a Mattermost server can force connected desktop clients to become unusable by exploiting improper URL validation, requiring user interaction (connecting to the malicious server). No public exploit code identified at time of analysis, though the attack method is trivial to implement given the disclosed details.
Mattermost Desktop App can be crashed remotely by malicious server administrators or plugin developers exploiting insufficient isolation of server-rendered content. Authenticated attackers with low-privilege server access who can control rendered content (via compromised server, malicious plugin, or modified server responses) can invoke window.close() to terminate the desktop client, causing a client-side denial of service. EPSS data not available; no public exploit code identified at time of analysis. CVSS 3.5 (Low severity) reflects limited impact scope - disruption to individual user sessions rather than system-wide compromise.
Server-Side Request Forgery in Mattermost 10.11.x through 11.5.1 allows authenticated attackers with slash command access to redirect custom slash command responses to attacker-controlled servers by manipulating the Host header. The vulnerability requires low-privileged authentication and high attack complexity (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:N), resulting in a CVSS score of 3.5. No public exploit code or active exploitation via CISA KEV has been identified at time of analysis. Vendor advisory available at mattermost.com/security-updates provides remediation guidance.
Password disclosure in Mattermost Server versions 11.5.0-11.5.1, 10.11.0-10.11.13, and 11.4.0-11.4.3 allows high-privilege administrators to view newly created user credentials, enabling impersonation attacks. The CVSS score of 6.5 reflects medium severity, requiring high-privilege access (PR:H) but offering network-based exploitation (AV:N) with low complexity (AC:L). While not currently listed in CISA KEV and no public exploit identified at time of analysis, the vendor-confirmed vulnerability (Mattermost Advisory MMSA-2026-00614) presents real risk in environments where privileged accounts are compromised or insider threats exist.
Authenticated team members with 'Manage Own Slash Commands' permission can hijack existing slash commands in Mattermost 11.5.x through 11.5.1, 10.11.x through 10.11.13, and 11.4.x through 11.4.3 by editing their own command triggers to match already-registered system or custom commands. This privilege escalation flaw (CWE-863: Incorrect Authorization) enables command impersonation, allowing attackers to intercept and potentially manipulate user interactions with legitimate slash commands. With CVSS 4.3 (low-medium severity) and EPSS data unavailable, real-world risk depends heavily on organizational use of slash commands for sensitive operations. No public exploit identified at time of analysis, and the attack requires authenticated access with specific permissions, limiting immediate exposure compared to unauthenticated network vulnerabilities.
Unauthorized access to public playbooks in Mattermost 10.11.x through 11.5.x allows authenticated users without proper permissions to retrieve public playbooks via the /get endpoint. The vulnerability affects all versions from 10.11.0 through 10.11.13, 11.4.0 through 11.4.3, and 11.5.0 through 11.5.1 due to missing public/private permission validation. With CVSS 4.3 (Medium) and requiring authenticated access (PR:L), this represents a privilege escalation issue allowing disclosure of potentially sensitive playbook configurations, but is limited to low confidentiality impact without integrity or availability compromise. No active exploitation confirmed (not in CISA KEV) and EPSS data not provided.
Authenticated Mattermost users can read private channel threads and direct messages they lack access to by exploiting the AI post rewrite endpoint. Versions 11.5.0 and 11.5.1 fail to verify channel membership before processing AI-assisted message rewrites, enabling privilege escalation from low-privileged authenticated users to access confidential communications. CVSS 6.5 reflects network-accessible attack with low complexity requiring only basic authentication. EPSS data not available; no public exploit or KEV listing identified at time of analysis.
Authenticated users in Mattermost Plugins can disrupt Gitlab integration by uninstalling instances or modifying webhook connections without proper authorization. The CWE-862 authorization flaw in versions <=11.5, 11.1.5, 10.13.11, and 11.3.4.0 allows users with low-level privileges (PR:L) to execute administrative commands via `/gitlab instance {option}` or `/gitlab webhook {option}`, resulting in availability impact (A:H) to the Gitlab plugin infrastructure. CVSS 6.5 reflects moderate risk, with EPSS data and active exploitation status not available at time of analysis.
Authorization bypass in Mattermost 10.11.x through 10.11.13 and 11.5.x through 11.5.1 allows authenticated users with 'Manage Playbook Configurations' permission to reassign playbooks to arbitrary teams via PUT API, circumventing team membership restrictions. This access control flaw enables lateral privilege escalation across team boundaries without proper authorization checks. EPSS exploitation probability data not available; no confirmed active exploitation (CISA KEV) or public exploit code identified at time of analysis.
Authenticated Mattermost channel members can forcibly reveal burn-on-read messages without recipient consent by exploiting missing X-Requested-With header validation on the reveal endpoint through crafted Markdown image tags. This bypasses the intended ephemeral messaging security control in Mattermost versions 11.4.x through 11.4.3 and 11.5.x through 11.5.1. The CVSS vector indicates network-accessible exploitation by low-privileged authenticated users with low attack complexity. Exploitation status: no public exploit identified at time of analysis. EPSS data not provided.
Memory exhaustion denial of service in Mattermost Server versions 11.5.x through 11.5.1, 10.11.x through 10.11.13, and 11.4.x through 11.4.3 allows authenticated attackers to crash the server by uploading maliciously crafted 7zip archives containing excessive folder declarations. The vulnerability stems from insufficient validation of 7zip archive structure before decompression, enabling resource exhaustion attacks with low attack complexity. EPSS data not available, not listed in CISA KEV, indicating no confirmed widespread exploitation at time of analysis.
Mattermost Plugins through version 11.5 allow authenticated users to bypass group-level access controls and create issues or attach comments to locked groups they should not access. Attackers holding membership in multiple groups can exploit missing API-level authorization checks via direct API requests to write data into restricted groups, violating intended access boundaries. EPSS risk data not available; CVSS 4.3 reflects low-privilege authenticated network attack with low complexity. No active exploitation confirmed by CISA KEV at time of analysis, though vendor advisory (MMSA-2026-00602) confirms the vulnerability.
Authorization bypass in Mattermost Plugins allows authenticated users to subscribe to unauthorized notification groups by exploiting prefix-matching namespace validation. Affected versions (≤11.5, 11.1.5, 10.13.11, 11.3.4.0) fail to enforce group whitelisting, enabling low-privileged plugin users to create groups sharing prefixes with authorized groups and thereby receive notifications or access information from out-of-scope channels. EPSS data unavailable; not listed in CISA KEV; CVSS 4.3 reflects low-privilege network exploitation with limited integrity impact but no confidentiality or availability compromise.
Cross-site scripting (XSS) in Mattermost Server 10.11.0-10.11.13 and 11.5.0-11.5.1 enables authenticated administrators to inject JavaScript code through unescaped variables in error page templates. Exploitation requires high-privilege (PR:H) administrative access to site configuration settings, limiting real-world risk despite network-based attack vector (AV:N). No active exploitation confirmed (not in CISA KEV). EPSS data not available for recent CVE. This is a stored XSS vulnerability affecting administrative workflows rather than end users.
Authenticated attackers can bypass token rotation in Mattermost's remote cluster invite confirmation process by reusing original invite tokens. The flaw affects Mattermost Server versions 11.5.x through 11.5.1 and 10.11.x through 10.11.13, allowing token reuse despite intended security controls. While rated low severity (CVSS 3.7), this represents an authentication bypass vulnerability (CWE-863) that undermines session management security. No active exploitation confirmed (not in CISA KEV), and no public exploit code identified at time of analysis.
Privilege escalation in Mattermost Server allows authenticated users with revoked channel posting permissions to continue modifying their existing posts. Affected versions include 11.5.0-11.5.1, 10.11.0-10.11.13, and 11.4.0-11.4.3. Attackers bypass authorization controls by sending direct API requests to post update and patch endpoints, circumventing permission checks that should prevent post edits after privileges are revoked. EPSS data not available; no confirmed active exploitation or public POC identified at time of analysis. CVSS 4.3 (Medium) reflects low integrity impact limited to existing content modification.
Resource exhaustion in Mattermost Server 10.11.x through 11.5.1 allows authenticated users to trigger denial of service by sending oversized HTTP POST requests to the /api/v1/meetings endpoint. The vulnerability affects three active release branches with no request size validation on the meeting start API. EPSS data not available; no confirmed active exploitation (not in CISA KEV); authentication requirement (PR:L) reduces immediate exposure to internal or compromised users. Vendor advisory MMSA-2026-00608 confirms the issue.
Authorization bypass in Mattermost shared channel synchronization allows authenticated remote cluster administrators to remove arbitrary users from any channel, including private channels outside the attacker's authorization scope. Affects versions 11.5.x through 11.5.1, 10.11.x through 10.11.13, and 11.4.x through 11.4.3. CVSS 4.3 reflects the low-privilege requirement (authenticated remote cluster) and limited impact scope (integrity only, no data exposure), though cross-tenant authorization violations in collaboration platforms warrant attention. EPSS data unavailable; no public exploit identified at time of analysis; not listed in CISA KEV.
OAuth authorization code interception in Mattermost 10.11.x through 10.11.13 and 11.5.x through 11.5.1 allows authenticated OAuth clients to redeem authorization codes issued to different clients. An attacker controlling a malicious OAuth application can intercept and exchange authorization codes meant for legitimate applications, potentially gaining unauthorized access to user data or sessions. CVSS score of 3.1 reflects high attack complexity and required privileges, with EPSS data not provided. Vendor patch released per Mattermost advisory MMSA-2026-00570.
Authenticated users in Mattermost 11.5.x through 11.5.1 and 10.11.x through 10.11.13 can modify post attachments, properties, and pin status beyond the configured edit time window. The vulnerability bypasses the PostEditTimeLimit control via patch and update API endpoints, allowing indefinite modification of non-message post metadata after the intended edit window expires. CVSS 3.1 (Low) reflects network vector with high complexity and low-privilege requirements, while no public exploit or CISA KEV listing exists at time of analysis.
Client-side denial-of-service in Mattermost allows remote attackers to crash user browsers via maliciously crafted SVG files embedded in OpenGraph metadata or Markdown images. The vulnerability affects Mattermost Server versions 11.5.0-11.5.1, 10.11.0-10.11.13, and 11.4.0-11.4.3, where the server fails to validate proxied image response bodies. Attackers exploit this by serving SVG files with misleading Content-Type headers (e.g., image/png) that bypass validation, causing resource exhaustion when rendered in victim browsers. CVSS rates this 4.3 (Medium) with network attack vector requiring user interaction, while EPSS data is not available. No evidence of active exploitation (not in CISA KEV) or public exploit code at time of analysis.
OpenClaw before 2026.4.22 allows workspace dotenv files to override connector endpoint hosts for Matrix, Mattermost, IRC, and Synology connectors, enabling local attackers with workspace access to redirect runtime traffic to malicious endpoints. The vulnerability requires local access and user interaction but allows high confidentiality impact through traffic interception. No active exploitation has been identified, but a vendor-released patch is available.
Mattermost versions 10.11.x through 10.11.12, 11.3.x through 11.3.2, 11.4.x through 11.4.2, and 11.5.0 fail to enforce atomic consumption of guest magic link tokens, allowing unauthenticated attackers to establish multiple concurrent authenticated sessions from a single valid magic link. This enables unauthorized access and potential information disclosure without requiring additional credentials or user interaction beyond intercepting or obtaining the link.
Mattermost versions 10.11.x through 10.11.12, 11.3.x through 11.3.2, 11.4.x through 11.4.2, and 11.5.0 fail to validate CSRF tokens on authentication endpoints, allowing remote attackers to update a targeted user's authentication method by tricking them into visiting a malicious page. The attack requires user interaction (UI:R) and results in high confidentiality and integrity impact, but no public exploit or CISA KEV confirmation has been identified at the time of analysis.
Mattermost versions 10.11.0 through 10.11.12 fail to validate workspace ownership during Connected Workspaces API interactions, allowing a malicious remote server with high privileges to modify the displayed status of local users. This affects organizations using the Connected Workspaces federation feature and requires an attacker to already possess high administrative privileges on a connected remote instance. The vulnerability has CVSS 2.7 (low severity) and no public exploit code or active exploitation has been identified.
Mattermost Plugins versions 2.1.3.0 and earlier allow remote attackers without authentication to cause denial of service through memory exhaustion by sending oversized JSON payloads to the /changes webhook endpoint. The vulnerability stems from a lack of request body size validation, enabling attackers to exhaust server memory and crash the service. CVSS is 3.7 (low severity) with low exploitability complexity, and no public exploit or active exploitation has been confirmed.
Mattermost Plugins versions 2.3.1 and earlier allow unauthenticated remote attackers to trigger denial of service by sending oversized JSON payloads to the /lifecycle webhook endpoint, causing memory exhaustion due to missing request body size validation. CVSS 3.7 reflects low severity despite network accessibility; EPSS and active exploitation status not independently confirmed from available data.
Focalboard 8.0 fails to validate file ownership during file serving, allowing authenticated attackers to read arbitrary uploaded files if they know the target fileID. The vulnerability affects all versions of the standalone Focalboard product, which is no longer maintained by Mattermost and will not receive security patches. An attacker with valid credentials can exploit this authorization bypass with no additional user interaction to access sensitive file contents.
Second-order SQL injection in Focalboard 8.0 and earlier allows authenticated attackers to exfiltrate password hashes and other sensitive data via time-based blind injection through the category reorder API. Malicious SQL payloads injected into category ID fields persist in the database and execute unsanitized during subsequent reorder operations. Focalboard standalone is unsupported and will not receive a security patch. EPSS score of 0.01% indicates very low observed exploitation probability, consistent with the narrow attack surface requiring authenticated access to an end-of-life product.
Mattermost Advanced Logging configuration fails to properly validate file target paths, allowing authenticated system administrators to read arbitrary files from the host system during support packet generation. The vulnerability affects Mattermost versions 11.4.0 and earlier in the 11.4.x line, 11.3.1 and earlier in the 11.3.x line, 11.2.3 and earlier in the 11.2.x line, and 10.11.11 and earlier in the 10.11.x line. An authenticated administrator with access to Advanced Logging JSON configuration can craft a malicious configuration to traverse the filesystem and extract sensitive host files through the support packet mechanism. No public exploit code has been identified at time of analysis, though exploitation requires administrative privileges and is not automatable according to CISA SSVC assessment.
Mattermost Plugins versions 11.4 and earlier, including 10.11.11.0, fail to validate webhook request timestamps, enabling attackers with high privileges to replay webhook requests and corrupt Zoom meeting state within Mattermost deployments. The vulnerability carries a CVSS score of 2.2 with low attack complexity but requires high-privilege authentication; no public exploit has been identified at time of analysis, and CISA has not flagged this for active exploitation.
Mattermost versions 11.2.x through 11.4.x fail to enforce view restrictions on group member endpoints, allowing authenticated guest users to enumerate user IDs beyond their authorized visibility scope. This authorization bypass requires valid credentials but enables attackers to discover internal user information through the group retrieval API. No patch is currently available for affected versions.
Mattermost server versions 10.11.x through 11.4.x fail to validate decompressed archive entry sizes during ZIP file extraction, allowing authenticated users with file upload permissions to trigger denial of service by uploading crafted zip bombs that exhaust server memory. The vulnerability affects Mattermost 10.11.0-10.11.11, 11.2.0-11.2.3, 11.3.0-11.3.1, and 11.4.0, with CVSS 6.5 (medium) reflecting the requirement for prior authentication and limited scope (availability impact only). No public exploit identified at time of analysis, though the attack vector is network-accessible and requires low complexity once an attacker has valid upload credentials.
Mattermost Plugins versions 11.4 and earlier fail to validate incoming request sizes on webhook endpoints, allowing authenticated attackers to trigger denial of service by sending oversized requests. The vulnerability affects multiple Mattermost release branches (10.x, 11.0.x, 11.1.x, 11.3.x) and has been assigned CVSS 4.9 (medium severity) with no public exploit identified at time of analysis. While exploitability requires high-privilege authentication and manual intervention, the lack of request size enforcement on webhooks represents a fundamental input validation gap that could disrupt service availability in production environments.
Mattermost bulk export functionality fails to apply proper file permissions, allowing unprivileged local users on affected servers to read sensitive exported data. Mattermost versions 11.4.0, 11.3.x through 11.3.1, 11.2.x through 11.2.3, and 10.11.x through 10.11.11 are vulnerable (CVE-2026-3113, MMSA-2026-00593). An authenticated local attacker with login credentials can access bulk export files created by other users, leading to unauthorized information disclosure of potentially sensitive team and channel communications. No public exploit code has been identified at time of analysis, and CISA has not listed this in the Known Exploited Vulnerabilities catalog, though the vulnerability's automatable nature and low attack complexity warrant prompt patching.
Mattermost versions 11.2.x through 11.2.2, 10.11.x through 10.11.10, 11.4.0, and 11.3.x through 11.3.1 fail to properly restrict team-level access during remote cluster membership synchronization, allowing a malicious remote cluster to grant users access to entire private teams rather than limiting access to only shared channels. An authenticated attacker controlling a federated remote cluster can send crafted membership sync messages to trigger unintended team membership assignment, resulting in unauthorized access to private team resources. The EPSS score of 0.03% (percentile 7%) indicates low real-world exploitation probability, and no public exploit code has been identified at time of analysis.
A Cross-Site Request Forgery (CSRF) vulnerability exists in Mattermost's access control policy activation endpoint due to improper CSRF token validation. Authenticated attackers can exploit this to trick administrators into activating or deactivating access control policies via crafted requests, potentially altering security posture. The vulnerability affects Mattermost versions 10.11.x through 10.11.10, 11.2.x through 11.2.2, 11.3.x through 11.3.1, and 11.4.0. No public exploitation or active KEV status has been reported, though the CISA SSVC framework indicates no current exploitation evidence and non-automatable attack requirements, limiting immediate real-world threat severity.
Mattermost fails to properly sanitize external SVG rendering in link embeds, allowing unauthenticated users to trigger denial-of-service conditions in both web and desktop applications. An attacker can create a malicious GitHub issue or pull request containing a crafted external SVG that crashes the Mattermost webapp and desktop client when the link is embedded. This vulnerability affects Mattermost versions 11.4.0 and below, 11.3.1 and below, 11.2.3 and below, and 10.11.11 and below, with a CVSS score of 4.3 indicating low-to-moderate severity focused on availability impact rather than confidentiality or integrity.
Mattermost fails to properly validate user identity in OpenID Connect authentication logic due to an overly permissive substring matching flaw in the IsSameUser() comparison function, allowing attackers with high privileges to take over arbitrary user accounts through the user discovery flow. This affects Mattermost versions 10.11.0-10.11.11, 11.2.0-11.2.3, 11.3.0-11.3.1, and 11.4.0. While the CVSS score of 5.7 is moderate and requires high privilege access and user interaction, the core impact is account takeover with full account compromise possible.
Mattermost versions 11.4.0, 11.3.x through 11.3.1, 11.2.x through 11.2.3, and 10.11.x through 10.11.11 lack proper rate limiting on login endpoints, allowing unauthenticated attackers to trigger denial of service through HTTP/2 single packet attacks delivering 100+ parallel login requests. This causes server crashes and forced restarts. While the CVSS score of 4.3 is moderate and requires low attack complexity over the network, the vulnerability enables complete service disruption without authentication.
Mattermost 10.11.x through 10.11.10 fails to clear cached permalink preview data when a user's channel access is revoked, allowing authenticated users to view private channel content through previously cached previews until the cache expires or they re-login. An authenticated attacker who previously had access to a private channel can exploit this to maintain visibility into sensitive channel communications after access removal. A patch is not currently available for this medium-severity vulnerability.
Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role.
Mattermost versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier contain an array length handling vulnerability in the calls plugin that allows unauthenticated remote attackers to trigger out-of-memory (OOM) errors and crash the server by sending maliciously crafted msgpack frames over websocket connections. With a CVSS score of 5.8 and network-based attack vector requiring no privileges or user interaction, this denial-of-service vulnerability poses a moderate but easily exploitable availability risk to any exposed Mattermost deployment.
Mattermost versions 11.3.0 and 11.2.2 and earlier fail to properly validate the run_create permission when a playbook ID is empty, allowing authenticated team members to create unauthorized playbook runs through the API. This permission bypass could enable attackers with valid credentials to perform actions they should not be permitted to execute within the platform.
Mattermost Server versions 11.3.0, 11.2.x through 11.2.2, and 10.11.x through 10.11.10 contain a server-side request forgery (SSRF) vulnerability due to improper validation of IPv4-mapped IPv6 addresses, allowing authenticated attackers to bypass reserved IP restrictions and access internal services. An attacker with login credentials can craft requests using IPv6 notation (such as [::ffff:127.0.0.1]) to reach localhost or other restricted internal endpoints that would normally be blocked. No patch is currently available for this vulnerability.
A remote code execution vulnerability (CVSS 4.3) that allows guest users without read permissions. Remediation should follow standard vulnerability management procedures.
CVE-2026-22545 is a security vulnerability (CVSS 3.1) that allows an authenticated attacker. Remediation should follow standard vulnerability management procedures.
CVE-2026-21386 is a security vulnerability (CVSS 4.3) that allows an authenticated team member. Remediation should follow standard vulnerability management procedures.
Mattermost versions 11.3.0, 11.2.2, and 10.11.10 and earlier lack proper memory bounds checking when processing DOC file uploads, enabling authenticated attackers to trigger server memory exhaustion and denial of service. An attacker with valid credentials can upload a specially crafted DOC file to exhaust available memory and crash the Mattermost server. This vulnerability currently lacks a patch and affects multiple active versions of the platform.
This vulnerability in Mattermost allows guest users to bypass team-specific file upload permissions through a cross-team file metadata reuse attack. Affected versions include Mattermost 11.3.0, 11.2.x up to 11.2.2, and 10.11.x up to 10.11.10. An authenticated guest user can upload a file in a team where they have upload_file permission, then reuse that file's metadata in POST requests to channels in different teams where they lack upload permission, resulting in unauthorized file posting with potential integrity impact.
Mattermost fails to properly validate User-Agent header tokens in versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier, allowing authenticated attackers to trigger request panics through specially crafted User-Agent headers. This denial-of-service vulnerability affects availability but requires prior authentication and results in only low-severity impact. While the CVSS score of 4.3 reflects the low severity, the practical risk depends on whether the application is exposed to untrusted authenticated users and whether automatic exploitation tools are readily available.
This vulnerability in Mattermost allows unauthenticated attackers to achieve remote code execution and exfiltrate sensitive credentials through malicious plugin installation on CI test instances that retain default admin credentials. Affected versions include Mattermost 10.11.x through 10.11.10, 11.2.x through 11.2.2, and 11.3.0, with the core issue stemming from insufficient access controls on plugin installation combined with default credential exposure. An attacker can upload a malicious plugin after modifying the import directory to gain full system compromise and access AWS and SMTP credentials stored in configuration files.
Mattermost versions 11.3.x up to and including 11.3.0 contain an information disclosure vulnerability where burn-on-read posts fail to maintain their redacted state when deleted, allowing authenticated channel members to view previously hidden message contents through WebSocket post deletion events. The vulnerability requires low-privilege authenticated access and results in confidentiality loss of sensitive communications that were intentionally designed to be self-destructing. With a CVSS score of 4.3 and network-based attack vector, this represents a meaningful but contained risk primarily affecting organizations relying on Mattermost's burn-on-read feature for secure internal communications.
Mattermost fails to properly bound memory allocation when processing PSD (Photoshop) image files, allowing authenticated attackers to exhaust server memory and trigger denial of service by uploading a specially crafted PSD file. The vulnerability affects Mattermost versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier. With a CVSS score of 4.3 and a low attack complexity requirement, this represents a moderate but exploitable risk for organizations running affected versions where user file upload is permitted.
This vulnerability is an improper access control flaw in Mattermost's channel search functionality that allows removed team members to enumerate all public channels within private teams. Affected versions include Mattermost 11.3.x through 11.3.0, 11.2.x through 11.2.2, and 10.11.x through 10.11.10. An authenticated attacker who has been removed from a team can query the channel search API endpoint to discover the complete list of public channels in that private team, resulting in information disclosure without requiring elevated privileges.
Mattermost fails to properly sanitize client-supplied post metadata in its post update API endpoint, allowing authenticated attackers to spoof permalink embeds and impersonate other users through crafted PUT requests. The vulnerability affects Mattermost versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier. While the CVSS score of 4.3 is moderate and requires authentication, the integrity impact allows attackers to deceive users by falsely attributing messages to legitimate users, potentially facilitating social engineering or misinformation campaigns within Mattermost instances.
Mattermost Plugins versions 11.3 and earlier fail to implement proper authorization checks on comment block modifications, allowing authenticated users with editor permissions to modify comments created by other board members without restriction. An authorized attacker can alter or tamper with comments from colleagues, potentially modifying project records, discussions, or audit trails. With a CVSS score of 4.3 and low attack complexity, this represents a moderate integrity risk in collaborative environments where comment authenticity is important, though exploitation requires prior authentication and editor-level access.
Mattermost fails to properly validate user permissions when filtering invite IDs during team creation, allowing authenticated users to bypass access controls and register unauthorized accounts using leaked or discovered invite tokens. Affected versions include Mattermost 11.3.0 and earlier in the 11.3.x branch, 11.2.2 and earlier in the 11.2.x branch, and 10.11.10 and earlier in the 10.11.x branch. An authenticated attacker with knowledge of valid invite IDs can circumvent intended access restrictions to create accounts that should be restricted, resulting in unauthorized account registration and potential lateral movement within the Mattermost instance.
Mattermost fails to enforce response size limits on integration action endpoints, allowing an authenticated attacker to trigger server memory exhaustion and denial of service by clicking an interactive message button that connects to a malicious integration server returning arbitrarily large responses. This vulnerability affects Mattermost versions 11.3.0, 11.2.x up to 11.2.2, and 10.11.x up to 10.11.10. While the CVSS score of 5.3 is moderate, the attack requires user interaction (UI:R) and network access, but can be reliably triggered by any authenticated user interacting with crafted messages.
Mattermost Desktop is affected by inclusion of functionality from untrusted control sphere (CVSS 4.6).
Arbitrary code execution in Mattermost Desktop App through version 6.2.0 results from insufficient validation of help menu links, enabling a malicious server administrator to execute arbitrary executables on affected users' systems when they click specially crafted help items. This vulnerability affects multiple versions including 5.2.13.0 and 6.0, requiring user interaction and authenticated server access to exploit. No patch is currently available for this HIGH severity vulnerability.
Mattermost versions 10.11.x <= 10.11.9 fail to enforce invite permissions when updating team settings, which allows team administrators without proper permissions to bypass restrictions and add users to their team via API requests. Mattermost Advisory ID: MMSA-2025-00561 [CVSS 3.8 LOW]
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. [CVSS 4.3 MEDIUM]
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to sanitize sensitive data in WebSocket messages which allows authenticated users to exfiltrate password hashes and MFA secrets via profile nickname updates or email verification events. [CVSS 5.7 MEDIUM]
Mattermost Server versions 11.1.x through 11.1.2, 10.11.x through 10.11.9, and 11.2.x through 11.2.1 inadequately enforce login method restrictions, permitting authenticated users to circumvent SSO-only requirements by authenticating with a userID instead. This allows an attacker with valid credentials to gain unauthorized access to accounts restricted to single sign-on authentication. No patch is currently available for this vulnerability.
Insufficient identity validation in Mattermost Server (versions 11.1.x through 11.2.1 and earlier) and Zoom Plugin (versions up to 1.11.0) allows authenticated users to initiate Zoom meetings as arbitrary users and modify other users' posts through direct API manipulation. An attacker with valid credentials can exploit the /api/v1/askPMI endpoint to impersonate other users and alter post content without proper authorization checks. The vulnerability affects multiple Mattermost and plugin versions with no patch currently available.
Mattermost and Zoom plugin versions fail to properly authenticate users before allowing modifications to Zoom meeting restrictions, enabling any logged-in user to alter meeting settings across arbitrary channels. Affected versions include Mattermost 11.1.x through 11.1.2, 10.11.x through 10.11.9, 11.2.x through 11.2.1, and Zoom plugin versions up to 1.11.0. No patch is currently available for this privilege escalation vulnerability.
Mattermost versions 11.1.2, 10.11.9, and 11.2.1 and earlier fail to properly enforce access controls in the Jira plugin's /create-issue API endpoint, allowing authenticated users to read restricted post content and attachments from channels they cannot access by referencing post IDs. An attacker with Jira plugin access can exploit this to enumerate and exfiltrate sensitive information from private or restricted channels. No patch is currently available for affected versions.