CVE-2024-12247: Mattermost Server

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

Mattermost versions 9.7.x <= 9.7.5, 9.8.x <= 9.8.2 and 9.9.x <= 9.9.2 fail to properly propagate permission scheme updates across cluster nodes which allows a user to keep old permissions, even if the permission scheme has been updated.

Affected products

• Mattermost Mattermost Server: from 9.7.0, before 9.7.6 (fixed in 9.7.6); from 9.8.0, before 9.8.3 (fixed in 9.8.3); from 9.9.0, before 9.9.3 (fixed in 9.9.3)

Published 2024-12-05. Last modified 2026-06-17.