CVE-2025-2570: Mattermost Server

Low severity, CVSS 2.7. EPSS: 0.3% chance of exploitation in the next 30 days.

Mattermost versions 10.5.x <= 10.5.3, 9.11.x <= 9.11.11 fail to check `RestrictSystemAdmin` setting if user doesn't have access to `ExperimentalSettings` which allows a System Manager to access `ExperimentSettings` when `RestrictSystemAdmin` is true via System Console.

Affected products

• Mattermost Mattermost Server: from 9.11.0, before 9.11.12 (fixed in 9.11.12); from 10.5.0, before 10.5.4 (fixed in 10.5.4)

Published 2025-05-15. Last modified 2026-06-17.