CVE-2026-9162
Fixed upstream EPSS <1%CVSS 4.3
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
Products: Mattermost
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/mattermost/mattermost-server | 11.7.1 |
| Go | github.com/mattermost/mattermost-server | 11.6.3 |
| Go | github.com/mattermost/mattermost-server | 11.5.6 |
| Go | github.com/mattermost/mattermost-server | 10.11.18 |
| Go | github.com/mattermost/mattermost-server | 10.11.18+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.5.6+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.6.3+incompatible |
| Go | github.com/mattermost/mattermost-server | 11.7.1+incompatible |