Arbitrary Code Execution Vulnerability in Mattermost Desktop App
CVE-2026-1046

7.6HIGH

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 February 2026

What is CVE-2026-1046?

The Mattermost Desktop App contains a security flaw where various versions fail to properly validate help links. This vulnerability could allow a malicious Mattermost server to execute arbitrary executables on a user's system simply by clicking certain items within the Help menu. Users of versions 5.2.13.0 and earlier, as well as 6.0 and 6.2.0, should take caution and consider updating to mitigate potential security risks. For more detailed information, refer to the Mattermost Advisory at the provided link.

Affected Version(s)

Mattermost 0 <= 6.2.0

Mattermost 0 <= 5.2.13

Mattermost 6.1.0

References

https://mattermost.com/security-updates
vendor-advisory

CVSS V3.1

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

hackerman70000
.