CVE-2025-14435: Mattermost Server

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Mattermost versions 10.11.x <= 10.11.8, 11.1.x <= 11.1.1, 11.0.x <= 11.0.6 fail to prevent infinite re-renders on API errors which allows authenticated users to cause application-level DoS via triggering unbounded component re-render loops.

Affected products

• Mattermost Mattermost Server: from 10.11.0, before 10.11.9 (fixed in 10.11.9); from 11.0.0, before 11.0.7 (fixed in 11.0.7); from 11.1.0, before 11.1.2 (fixed in 11.1.2)

Published 2026-01-16. Last modified 2026-06-17.