CVE-2026-9162CWE-613

Global session revocation does not invalidate active WebSocket connections

Medium · published June 22, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
25.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00334 · 25.6th percentile
Weakness
CWE-613 · Insufficient Session Expiration
Published
2026-06-22T13:36Z
EPSS history
Timeline
  • 22 JUN 13:36Z
    Global session revocation does not invalidate active WebSocket connections
    cvelistv5