CVE-2026-9162

—

CVSS 3.1

4.3 medium

EPSS

<1%p26

Published

Jun 22, 2026 (Jun 22, 2026)

Modified

Sep 15, 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

Vendors: mattermost
Products: mattermost server
Ecosystems: go
Weakness: CWE-613
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GHSA: GHSA-h998-hxxj-8q83 (medium)

NVD CVE.org GitHub PoCs EPSS (0.3%)

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