CVE-2026-9162

Global session revocation does not invalidate active WebSocket connections

State: Published
Severity: 4.3 Medium
Published: Jun 22, 2026
Updated: Jun 22, 2026
Reserved: May 21, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	Mattermost

Weaknesses

CWE-613 Insufficient Session Expiration

Affected Products

Product	Versions
MattermostMattermost	11.7.0 through 11.7.0Affected 11.6.0 through 11.6.2Affected 11.5.0 through 11.5.5Affected 10.11.0 through 10.11.17Affected 11.8.0Not affected 11.7.1Not affected 11.6.3Not affected 11.5.6Not affected 10.11.18Not affected

References

MMSA-2026-00664vendor-advisory

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