How to fix CVE-2026-1046?

Q: How to fix CVE-2026-1046?

Within 24 hours: inventory all Mattermost Desktop App deployments and identify affected versions (≤6.0, 6.2.0, 5.2.13.0); communicate risk to users and restrict access if possible. Within 7 days: disable the Help menu feature via server configuration, or implement network controls to restrict users from connecting to untrusted Mattermost servers. Within 30 days: monitor vendor for patch availability and test in pre-production environment; upgrade all affected instances to patched versions upon release; conduct audit of Mattermost server configurations to detect any suspicious help link modifications.

CVE-2026-1046

HIGH

2026-02-16 [email protected]

7.6

CVSS 3.1

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

None

Availability

Low

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Feb 16, 2026 - 13:16 nvd

HIGH 7.6

Description

Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577

Analysis

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. …

Remediation

Within 24 hours: inventory all Mattermost Desktop App deployments and identify affected versions (≤6.0, 6.2.0, 5.2.13.0); communicate risk to users and restrict access if possible. Within 7 days: disable the Help menu feature via server configuration, or implement network controls to restrict users from connecting to untrusted Mattermost servers. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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Get intelligence summaries, risk assessment, exploit details, threat intel, and remediation guidance.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +38

POC: 0

CVE-2026-1046 vulnerability details – vuln.today

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CVE-2026-1046

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CVE-2026-1046

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External POC / Exploit Code