CVE-2025-25274: Mattermost Server

High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Mattermost versions 10.4.x <= 10.4.2, 10.3.x <= 10.3.3, 9.11.x <= 9.11.8 fail to restrict command execution in archived channels, which allows authenticated users to run commands in archived channels.

Affected products

• Mattermost Mattermost Server: from 9.11.0, before 9.11.9 (fixed in 9.11.9); from 10.3.0, before 10.3.4 (fixed in 10.3.4); from 10.4.0, before 10.4.3 (fixed in 10.4.3)

Published 2025-03-21. Last modified 2026-06-17.