What is GHSA-h998-hxxj-8q83?

GHSA-h998-hxxj-8q83 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.7.x \u003c= 11.7.0, 11.6.x \u003c= 11.6.2, 11.5.x \u003c= 11.5.5, 10.11.x \u003c= 10.11.17...

Which CVE IDs does GHSA-h998-hxxj-8q83 cover?

GHSA-h998-hxxj-8q83 covers the following CVE IDs: CVE-2026-9162. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-h998-hxxj-8q83?

GHSA-h998-hxxj-8q83 has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

GHSA-h998-hxxj-8q83MediumCVSS 4.3

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...

Vendor

GitHub Security Advisories

Published

June 22, 2026

Last Modified

June 22, 2026

🔗 CVE IDs covered (1)

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

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-9162
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-h998-hxxj-8q83