CVE-2026-86349

Mattermost server versions 11.9.x ≤ 11.9.0, 11.8.x ≤ 11.8.4, 11.7.x ≤ 11.7.8, and 10.11.x ≤ 10.11.22 are affected by an algorithmic denial of service in the server-side Markdown parser. The root cause is a failure to limit nesting depth , allowing an authenticated attacker to exhaust CPU resource...