CVE-2024-2447: Mattermost Server

Medium severity, CVSS 6.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Mattermost versions 8.1.x before 8.1.11, 9.3.x before 9.3.3, 9.4.x before 9.4.4, and 9.5.x before 9.5.2 fail to authenticate the source of certain types of post actions, allowing an authenticated attacker to create posts as other users via a crafted post action.

Affected products

• Mattermost Mattermost Server: from 8.1.0, before 8.1.11 (fixed in 8.1.11); from 9.3.0, before 9.3.3 (fixed in 9.3.3); from 9.4.0, before 9.4.4 (fixed in 9.4.4); from 9.5.0, before 9.5.2 (fixed in 9.5.2)

Published 2024-04-05. Last modified 2026-06-17.