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Unrated severityNVD Advisory· Published Jun 22, 2026· Updated Jun 22, 2026

Global session revocation does not invalidate active WebSocket connections

CVE-2026-9162

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

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

1
  • Mattermost/Mattermostllm-fuzzy
    Range: 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17

Patches

Vulnerability mechanics

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References

1

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