What is CVE-2026-9162?

CVE-2026-9162 is a medium-severity vulnerability in Mattermost, classified under Insufficient Session Expiration. CVSS score: 4.3/10. Published 2026-06-22.

How severe is CVE-2026-9162?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Mattermost

CVE-2026-9162

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 exi…

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Mattermost — versions 11.7.0, 11.6.0, 11.5.0

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

responsibledisclosure@mattermost.com (vendor-advisory)

Frequently asked questions

What is CVE-2026-9162?: CVE-2026-9162 is a medium-severity vulnerability in Mattermost, classified under Insufficient Session Expiration. CVSS score: 4.3/10. Published 2026-06-22.
How severe is CVE-2026-9162?: Medium severity. CVSS v3 base score is 4.3 out of 10.