CVE-2025-3611: Mattermost Server

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

Mattermost versions 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly enforce access control restrictions for System Manager roles, allowing authenticated users with System Manager privileges to view team details they should not have access to via direct API requests to team endpoints, even when explicitly configured with 'No access' to Teams in the System Console.

Affected products

• Mattermost Mattermost Server: from 9.11.0, before 9.11.13 (fixed in 9.11.13); from 10.5.0, before 10.5.4 (fixed in 10.5.4); version 10.7.0 only

Published 2025-05-30. Last modified 2026-06-17.