Description
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for active WebSocket connections during global session revocation, which allows a user with an existing WebSocket connection to remain authenticated and continue receiving real-time events until the cached session expires or the client reconnects.. Mattermost Advisory ID: MMSA-2026-00664
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Mattermost Mattermost
Default version status: unaffected
11.7.0 to ≤ 11.7.0affected11.6.0 to ≤ 11.6.2affected11.5.0 to ≤ 11.5.5affected10.11.0 to ≤ 10.11.17affected11.8.0unaffected11.7.1unaffected11.6.3unaffected11.5.6unaffected10.11.18unaffected