Mattermost

SSRF vulnerabilities in AWX notification backends (webhook, Mattermost, Rocket.Chat, and Grafana) allow an authenticated organization notification administrator to cause the AWX control node to issue outbound HTTP requests to internal, loopback, or RFC-1918 addresses that are not externally reachable. Beyond basic SSRF, the webhook backend compounds the risk by following HTTP redirects and replaying configured Basic Authentication credentials to the redirect destination regardless of host change, enabling credential exfiltration to attacker-controlled endpoints; the Grafana backend similarly exposes its API key by forwarding the Authorization header verbatim to any configured target URL. No public exploit has been identified at time of analysis, but the Changed scope and high confidentiality impact in the CVSS vector reflect significant real-world risk given the network position AWX control nodes typically occupy.

Incorrect authorization in Mattermost Boards allows an authenticated board editor to relink any editable board to an arbitrary channel by exploiting a missing PermissionManageBoardRoles check on the channelId field of the batch endpoint. Affected are Mattermost versions 11.7.x through 11.7.6, 10.11.x through 10.11.21, and 11.8.x through 11.8.3 (advisory MMSA-2026-00686). No public exploit code or CISA KEV listing has been identified at time of analysis, but the low attack complexity and network accessibility make this straightforward to execute for any authenticated board editor.

Incorrect authorization in Mattermost's Boards component across versions 11.7.x through 11.7.6, 10.11.x through 10.11.21, and 11.8.x through 11.8.3 enables privilege escalation within board management. Board editors and non-guest team members can supply arbitrary values in BoardMember.Scheme* fields through the boards member API or archive-import endpoint, effectively granting board admin rights to any user without server-side enforcement. No public exploit has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.

Denial of service in Mattermost's Boards (focalboard) plugin allows any authenticated user to crash the plugin process and disrupt Boards availability for all users on the instance by sending a single malformed WebSocket message. The root cause is absent input validation on the teamId field type in custom_focalboard_SUBSCRIBE_TEAM WebSocket commands, classified under CWE-704 (Incorrect Type Conversion). Affected versions span 11.7.x through 11.7.6, 10.11.x through 10.11.21, and 11.8.x through 11.8.3; no public exploit has been identified at time of analysis.

Mattermost Desktop App versions through 6.2.2.0 expose the pre-auth server secret in plaintext within generated diagnostics reports, specifically in the Server Connectivity Step-3 output section. A local attacker who obtains a copy of a user's diagnostics report or log files - whether through filesystem access or social engineering - can extract this secret and use it to authenticate against the configured Mattermost server as a pre-authorized client. No active exploitation has been confirmed (not in CISA KEV) and no public exploit code has been identified at the time of analysis; the risk is realistic primarily in shared-workstation or insider-threat scenarios.

Incomplete cleanup of thread membership records in Mattermost allows a re-invited user to read private channel thread root post content and metadata they should no longer have access to. Affected are all Mattermost deployments on versions 10.11.x through 10.11.20 and 11.7.x through 11.7.5. An authenticated user who was previously removed from or left a team, and is subsequently re-invited, can exploit stale membership records via the team threads API to access residual private channel thread data. No public exploit identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.

Unauthorized message injection in the Mattermost GitLab Plugin (<=11.8) allows authenticated users to post bot-authored messages containing arbitrary URLs into restricted channels by exploiting two missing authorization checks: channel permission verification on the caller-supplied `post_id` parameter, and GitLab instance validation of the `web_url` parameter. Exploitation targets the `createIssue` and `attachCommentToIssue` API endpoints without requiring elevated privileges. No active exploitation is confirmed by CISA KEV and no public exploit code has been identified at time of analysis, but the low attack complexity and authenticated-only prerequisite make this a realistic internal threat in any Mattermost deployment running the GitLab integration.

Privilege escalation in Mattermost's channel administration API allows authenticated channel administrators to assign non-channel-scoped roles to channel members, exceeding their intended authorization boundary. Three active release lines are affected: 10.11.x through 10.11.21, 11.7.x through 11.7.6, and 11.8.x through 11.8.2. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.

Private channel membership disclosure in Mattermost's Boards feature allows any authenticated team member to enumerate who belongs to private channels they are not authorized to view. Affected across three concurrently maintained release trains - 11.7.x through 11.7.6, 10.11.x through 10.11.21, and 11.8.x through 11.8.3 - the flaw is exploitable by any valid team account via standard board management API calls. No public exploit or active exploitation has been identified at time of analysis; the CVSS score of 4.3 (PR:L, C:L) accurately reflects the limited but real confidentiality impact, particularly meaningful in regulated environments where private channel membership itself is sensitive.

Mattermost's Playbooks feature in versions 11.7.x through 11.7.6 and 10.11.x through 10.11.21 omits run-state enforcement on API write operations, allowing any authenticated run participant to alter completed playbook runs via REST and GraphQL endpoints. An attacker with low privileges can overwrite status, checklists, retrospective content, ownership, and participant lists on runs that should be immutable once finished, undermining post-incident audit integrity. No public exploit has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog.

Incorrect authorization in Mattermost's OAuth and personal access token management endpoints allows an OAuth application holding a delegated user token to call account-management endpoints beyond its intended scope, revoking the victim user's authorizations or tokens for unrelated integrations. Affected are Mattermost 11.7.0 through 11.7.6 and 10.11.0 through 10.11.21. No public exploit code has been identified and this vulnerability is not listed in the CISA KEV catalog, though the low-complexity, network-accessible nature of the flaw makes it straightforward to abuse for any actor who has legitimately obtained an OAuth delegated token.

Privilege escalation in Mattermost's Boards feature allows a low-privileged board member to elevate a guest user to Board Admin by importing a specially crafted .boardarchive file. Affected are Mattermost versions 10.11.0 through 10.11.21 and 11.7.0 through 11.7.6. No public exploit or KEV listing has been identified, but the low attack complexity and the insider-threat profile make this a meaningful risk in multi-tenant or externally-collaborative Mattermost deployments.

Incorrect authorization in Mattermost's ABAC policy unassign API endpoint allows an authenticated team administrator to remove attribute-based access control policy assignments from channels that no longer belong to their team. Affected releases are Mattermost 11.7.0 through 11.7.6 and 11.8.0 through 11.8.3, tracked as MMSA-2026-00718 (ENISA EUVD-2026-60212). The exploit window opens when a channel is migrated between teams and the endpoint fails to re-verify team membership before executing the unassignment, letting a malicious admin modify access-control policy state beyond their administrative boundary.

Privilege retention in Mattermost Boards allows a user demoted to System Guest to continue exercising Board Admin privileges via the Boards REST API or UI. Affected are Mattermost versions 11.7.0-11.7.6, 10.11.0-10.11.21, and 11.8.0-11.8.3, where the SchemeAdmin flag is not reconciled against the user's current role during or after demotion. An authenticated attacker in this state can invoke admin-only Boards operations - including modifying board permissions and settings - without detection by role-based access checks. No public exploit code is identified and no CISA KEV listing is present at time of analysis.

Memory exhaustion and unbounded disk consumption in Mattermost's Boards archive import handler expose self-hosted deployments to authenticated denial-of-service. Affected versions span the 10.11.x, 11.7.x, 11.8.x, and 11.9.x release trains, all of which fail to enforce decompressed content size limits or respect the configured maximum file size when processing .boardarchive uploads. Any authenticated user with access to the Boards import endpoint can trigger this condition; no public exploit has been identified at time of analysis and the vulnerability does not appear in CISA KEV.

Path traversal in Mattermost allows an admin user with SAML system-console write permissions to delete arbitrary files outside the intended directory, causing high availability impact. Affected versions include 10.11.x through 10.11.20, 11.6.x through 11.6.5, 11.7.x through 11.7.3, and 11.8.0. No public exploit is identified at time of analysis, but the required high privileges limit the immediate risk.

Denial of service vulnerability in Mattermost allows authenticated users to exhaust server resources by uploading crafted animated GIFs as custom emoji. Affects versions 10.11.x, 11.6.x, 11.7.x, and 11.8.x up to certain patch levels. No active exploitation or public exploit is known, but patches are available from the vendor.

Denial of service in Mattermost 10.11.x through 11.8.x allows authenticated users with file-upload permission to degrade file-upload performance for all users by exploiting unbounded resource consumption during server-side document extraction. Attackers can repeatedly upload small documents that are expensive to extract, saturating the extraction worker pool and causing service degradation. No active exploitation or public exploit code is reported, but the low attack complexity and minimal privileges make this an accessible DoS vector.

Improper null checking in Mattermost Desktop App versions ≤6.2, 5.5.13, and 6.0.2.0 enables any authenticated channel member to crash the Desktop App of all other members in the same channel by posting a crafted link containing an embedded image served without expected HTTP headers. The crash is client-side and can be made persistent if the malicious message remains in the channel, forcing repeated crashes each time an affected client reconnects. No public exploit has been identified at time of analysis, but the low-privilege attack vector and trivial reproduction make this a realistic insider or compromised-account threat in collaborative environments.

Mattermost Desktop App across the 5.x and 6.x release branches can be crashed by a malicious server operator through unvalidated inter-process payloads sent from the Mattermost Web App to the Desktop App. The root cause is the absence of payload validation in the Web-to-Desktop communication channel, enabling a server owner to send a malformed method payload that causes uncontrolled processing and application termination on the connected client. No public exploit code has been identified at time of analysis and the vulnerability is not listed in the CISA KEV catalog; however, the network-accessible path and low-complexity exploitation make this a credible denial-of-service threat for organizations running self-hosted Mattermost deployments with untrusted or compromised server administrators.

Insecure Direct Object Reference (IDOR) in Mattermost's Playbooks feature permits any authenticated team member to overwrite another user's playbook metric configuration by supplying a foreign metric ID in a crafted import or update request. Affected branches are 11.7.x through 11.7.1, 11.6.x through 11.6.4, and 10.11.x through 10.11.19, where the server authorizes metric writes based on team membership alone rather than verifying that the referenced metric ID belongs to the playbook being saved. No public exploit code has been identified and this vulnerability does not appear in CISA KEV at time of analysis.

Insufficient sanitization of team objects in Mattermost's scheme teams API endpoint allows an authenticated user holding the User Manager role to extract invite links for private teams from API responses and use those links to join or redistribute access to those teams. Affected versions are 11.7.x through 11.7.2 and 10.11.x through 10.11.19. No public exploit identified at time of analysis and exploitation has not been confirmed by CISA KEV, but the low attack complexity (AC:L) means a malicious User Manager could reliably reproduce this without trial and error.

Missing authorization in Mattermost's /share-channel slash command autocomplete handler allows any authenticated user to enumerate remote cluster connection metadata, regardless of whether they hold the manage_shared_channels permission. Affects three active release lines (11.7.x, 11.6.x, 10.11.x) and is classified under CWE-862 (Missing Authorization). No public exploit identified at time of analysis, and the vulnerability is not listed in CISA KEV; exploitation is constrained to authenticated users, limiting realistic blast radius to insider threat or compromised-account scenarios.

Deactivated guest accounts in Mattermost 11.6.x through 11.6.4 and 11.7.x through 11.7.2 can regain platform access using magic-link tokens issued before deactivation, because the magic-link login path omits an account-status check during session creation. This directly undermines guest account revocation as an access control mechanism - administrators who deactivate a guest account expecting immediate exclusion will find the control is defeatable while any pre-issued token remains valid. No public exploit code has been identified at time of analysis, and this vulnerability is not listed in the CISA KEV catalog.

Catastrophic regex backtracking in Mattermost's client-side markdown parser can be triggered by an authenticated user posting a specially crafted message attachment, causing a denial-of-service condition for every user rendering that channel. Affected builds span versions 11.7.x through 11.7.2, 11.6.x through 11.6.4, and 10.11.x through 10.11.19. No public exploit has been identified at time of analysis and this vulnerability is not listed in CISA KEV, though the low exploitation complexity (AC:L, PR:L) lowers the bar for any authenticated insider or compromised account.

Incorrect authorization in Mattermost's interactive post action handler allows authenticated users to trigger post actions in private channels they are not members of. The flaw stems from action cookies failing to bind to the specific channel of the target post - a cookie obtained from any accessible channel can be reused against posts in restricted private channels. Affected are Mattermost versions 11.7.x through 11.7.2, 11.6.x through 11.6.4, and 10.11.x through 10.11.19; no public exploit has been identified and the vulnerability is not listed in CISA KEV.

Mattermost's channel patch API fails to enforce authorization on the group_constrained flag, permitting any authenticated low-privilege member of a group message or direct message channel to remove all participants from the conversation. All three supported release lines are affected: 11.7.x through 11.7.2, 11.6.x through 11.6.4, and 10.11.x through 10.11.19. No public exploit code has been identified at time of analysis; however, the low attack complexity and minimal privilege requirement make this straightforward to abuse on any reachable Mattermost deployment.

Incoming webhook impersonation in Mattermost allows a requester holding webhook management permissions to post content attributed to arbitrary users in teams or channels those users do not belong to. Affected deployments span three active release branches: 11.7.x through 11.7.2, 11.6.x through 11.6.4, and 10.11.x through 10.11.19. No public exploit code exists and the vulnerability is not listed in CISA KEV; the CVSS score of 4.9 correctly reflects that exploitation is constrained by the High privilege requirement, limiting realistic risk to insider threats or compromised privileged accounts.

Post ownership verification is absent in Mattermost's shared channel inbound sync handler, allowing an authenticated remote cluster to forge sync messages that modify or delete posts authored by local users or other federated remotes. Affected versions span the 10.11.x, 11.6.x, and 11.7.x release trains up to and including 10.11.19, 11.6.4, and 11.7.2 respectively. No public exploit has been identified and CISA KEV confirmation is absent, but the integrity impact is direct and the attack complexity is low once federation trust is established.

Mattermost fails to invalidate OAuth refresh tokens when a user account is deactivated, enabling former users - or any attacker who possesses a valid refresh token - to continue minting functional access tokens against the OAuth refresh token grant endpoint indefinitely after access revocation should have taken effect. All three actively maintained release branches are affected (10.11.x, 11.6.x, 11.7.x), making this a cross-branch session-persistence flaw with high confidentiality and integrity impact on any workspace relying on OAuth-integrated access control. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in CISA KEV, though the attack path requires minimal skill for any party already holding a refresh token.

Denial of service in linkify-it (npm) through v5.0.0 lets remote unauthenticated attackers wedge a rendering worker by submitting tens of KB of repeated email/link-like text. The core public API LinkifyIt.prototype.match runs an O(N²) scan loop that re-slices the input and re-runs unanchored fuzzy regex searches once per match, so 64 KB of "a@b.com" burns ~2.5 s of single-threaded CPU and 128 KB ~10 s. The flaw is inherited by markdown-it (~21.6M weekly npm downloads) whenever linkify:true is set, exposing forums, chat, wikis and AI chat UIs; publicly available exploit code (a PoC in the GHSA advisory) exists, but there is no evidence of active exploitation.

Credential exposure in Mattermost Plugins (all branches ≤11.6, fixed in 10.18.11, 11.3.6, and 11.6.5.0) leaks valid or partially reconstructable OpenAI API keys into mattermost.log when the OpenAI API returns authentication failure responses. Any user with privileged read access to server logs or downloadable support packets can recover the key and authenticate to the victim organization's OpenAI account. No public exploit code or CISA KEV listing exists at time of analysis, but the CVSS Scope:Changed rating reflects that successful exploitation grants unauthorized access to an external, out-of-scope resource - the OpenAI account - with full confidentiality impact.

Server-side request forgery in the Mattermost Agents plugin MCP server (stdio mode) allows a low-privileged local attacker to make the server fetch arbitrary internal URLs submitted as file attachment references in post creation requests, enabling exfiltration of data from RFC 1918-addressed services on the internal network. Affected are Mattermost deployments running versions 10.11.x ≤ 10.11.18, 11.5.x ≤ 11.5.6, and 11.6.x ≤ 11.6.3 with the Agents plugin's MCP server active in stdio mode. No public exploit code or CISA KEV listing is present in the available data; exploitation is constrained to attackers who already have local access to the stdio MCP interface.

Markdown image rendering restrictions in Mattermost are bypassed specifically for AI bot tool result posts, enabling authenticated attackers to exfiltrate data to attacker-controlled infrastructure. Affected are Mattermost versions 10.11.x through 10.11.18, 11.5.x through 11.5.6, and 11.6.x through 11.6.3. When a victim's client renders an AI bot tool result post containing injected markdown image syntax, the client issues an outbound request to the attacker's server, leaking request metadata such as session tokens or channel context. No public exploit code exists and this vulnerability is not listed in the CISA KEV catalog at time of analysis.

Path traversal in Mattermost's Go server module allows authenticated remote attackers to redirect API calls to unintended endpoints by embedding path traversal components (e.g., '../') within crafted ID parameters. The affected library is github.com/mattermost/mattermost/server/public versions prior to v0.1.22, which fails to sanitize path parameters before constructing API route paths. Exploitation yields limited confidentiality and integrity impact (CVSS 5.4 Medium); no public exploit code and no CISA KEV listing have been identified at time of analysis.

Missing authorization in the Mattermost Google Drive plugin's file creation endpoint (all versions before 1.1.0) allows authenticated Mattermost users with a linked Google account to share Drive files into private channels they are not a member of, and to infer the existence and membership of those private channels. The root cause is CWE-862 (Missing Authorization): the endpoint processes the target channel ID supplied by the caller without verifying the caller belongs to that channel. No public exploit has been identified at time of analysis, and the vulnerability has not been added to the CISA KEV catalog.

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.

Credential leakage in Mattermost Desktop App versions up to 6.1 and 5.5.13.0 allows authenticated server users to harvest NTLM credentials from other users by embedding images that resolve to attacker-controlled external web servers. The client fails to enforce a strict domain allow list before forwarding Windows NTLM authentication challenges, so any post in a server without the image proxy enabled becomes a credential capture vector. No public exploit identified at time of analysis and EPSS is low (0.18%), but the scope-change CVSS of 7.7 reflects cross-user impact.

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.

Arbitrary file write in Mattermost via path traversal affects versions 11.6.x ≤ 11.6.1, 11.5.x ≤ 11.5.4, and 10.11.x ≤ 10.11.15/10.11.16 when shared channels with federated peers are in use. An attacker who controls a federated Mattermost server can supply crafted FileInfo.Name values during file sync to write files to arbitrary locations in the target server's filestore. No public exploit identified at time of analysis and the issue is not listed in CISA KEV.

Privilege escalation in Mattermost server (11.6.x, 11.5.x, and 10.11.x branches) allows a low-privileged user holding group-link permissions to promote themselves or other group members to team or channel administrator by setting the scheme_admin flag through group syncable link and patch API endpoints. The flaw stems from missing role-management authorization checks, and with a CVSS of 8.8 (network, low complexity, low privileges) it enables tenant-wide takeover of collaboration workspaces; no public exploit identified at time of analysis.

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.

Privilege escalation in Mattermost collaboration platform allows authenticated users holding delegated user-management permissions to modify built-in system role permissions via the role patch API, bypassing a required system-level permission check. Affects Mattermost 10.11.x through 10.11.16, 11.5.x through 11.5.4, and 11.6.x through 11.6.1. No public exploit identified at time of analysis; EPSS is very low (0.03%) and the SSVC framework reports no observed exploitation.

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.

Arbitrary file write in Mattermost Plugins (versions ≤1.1.5) lets an administrator of a remote, federated Mattermost server plant files at attacker-chosen paths inside the target server's filestore by supplying a malicious, unsanitized filename through the shared-channel attachment sync protocol. The flaw stems from CWE-22 path traversal in the export-path construction logic and carries CVSS 8.0 with a changed scope, reflecting that a compromised or hostile federation peer can affect resources beyond the plugin's intended boundary. There is no public exploit identified at time of analysis, and CISA's SSVC framework records exploitation status as 'none' but technical impact as 'total'.

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.

Broken object-level authorization in the Mattermost Boards feature lets an authenticated low-privileged user retrieve and download files owned by other users or teams by supplying valid file IDs in crafted Boards API requests. Affected self-hosted builds span the 10.11.x, 11.4.x, 11.5.x and 11.6.x branches. There is no public exploit identified at time of analysis and EPSS is very low (0.03%), but the flaw is a straightforward IDOR yielding high-confidentiality impact across team/tenant boundaries.

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.

Denial of service in Mattermost server (versions 11.6.0, 11.5.0-11.5.3, 11.4.0-11.4.4, and 10.11.0-10.11.14) allows remote attackers to crash the server process by sending a crafted msgpack-encoded binary WebSocket frame to the public endpoint. The flaw stems from missing validation of frame sizes before memory allocation, enabling a full service outage for all users. No public exploit identified at time of analysis, and the CVSS 7.5 score reflects the unauthenticated network-reachable nature of the attack with high availability impact.

Denial of service in Mattermost self-hosted server (versions 11.6.0, 11.5.x ≤11.5.3, 11.4.x ≤11.4.4, and 10.11.x ≤10.11.14) allows remote unauthenticated attackers to exhaust server resources by sending oversized HTTP requests to plugin endpoints, which fail to enforce request body size limits. There is no public exploit identified at time of analysis, and the EPSS score is very low (0.04%, 11th percentile), but the flaw is remotely reachable without authentication and a vendor patch is available. Impact is limited to availability - no data disclosure or integrity loss.

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.

Privilege escalation to full administrative control in Mattermost self-hosted server (versions 11.6.0 and earlier in the 11.6.x line, 11.5.3 and earlier, 11.4.4 and earlier, and 10.11.14 and earlier) allows a low-privileged authenticated user to abuse missing path-traversal validation on integration action URLs to invoke arbitrary internal APIs using the system administrator's Mattermost auth token. Because the request is executed with the admin token, the attacker effectively gains total control over the instance despite starting as an ordinary user. There is no public exploit identified at time of analysis, and the EPSS score is very low (0.03%), but the vendor-assigned CVSS of 9.9 reflects the severe privilege-crossing impact.

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.

Mattermost versions up to 11.5.1 expose sensitive credentials in plaintext within support packets due to insufficient sanitization of configuration fields. System administrators or anyone with access to support packets can obtain database passwords, API keys, and other sensitive credentials by downloading support packets from the System Console. The vulnerability affects multiple version branches (10.11.x, 11.4.x, 11.5.x) and poses significant risk for credential theft and lateral movement.

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.

Information disclosure in Mattermost Calls plugin versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 exposes TURN server credentials through support packets. Administrators with support packet access can extract plaintext credentials from exported plugin configurations, potentially compromising the WebRTC infrastructure used for voice/video calls. The vulnerability requires high privileges (admin) but affects confidentiality across trust boundaries (CVSS Scope:Changed).

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.