CVE-2025-24866: Mattermost Server

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

Mattermost versions 9.11.x <= 9.11.8  fail to enforce proper access controls on the /api/v4/audits endpoint, allowing users with delegated granular administration roles who lack access to Compliance Monitoring to retrieve User Activity Logs.

Affected products

• Mattermost Mattermost Server: from 9.11.0, before 9.11.9 (fixed in 9.11.9)

Published 2025-04-10. Last modified 2026-06-17.