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
Severity (CVSS)
| Base score | 4.3 |
|---|---|
| Severity | Medium |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| Provided by | CNA |
Weaknesses
- CWE-613 — CWE-613: Insufficient Session Expiration
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 11.7.0 to <=11.7.0; 11.6.0 to <=11.6.2; 11.5.0 to <=11.5.5; 10.11.0 to <=10.11.17; 11.8.0; 11.7.1; 11.6.3; 11.5.6; 10.11.18 |
References
- https://mattermost.com/security-updates (vendor-advisory)
Generated from the official CVE List on 22 Jun 2026 14:43 UTC.