What is GHSA-4v7j-4mvr-5975?

GHSA-4v7j-4mvr-5975 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.7.x \u003c= 11.7.2, 11.6.x \u003c= 11.6.4, 10.11.x \u003c= 10.11.19 fail to invalidate...

Which CVE IDs does GHSA-4v7j-4mvr-5975 cover?

GHSA-4v7j-4mvr-5975 covers the following CVE IDs: CVE-2026-9571. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-4v7j-4mvr-5975?

GHSA-4v7j-4mvr-5975 has a CVSS v3 base score of 5.9, published by GitHub Security Advisories.

GHSA-4v7j-4mvr-5975MediumCVSS 5.9

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate...

Vendor

GitHub Security Advisories

Published

July 13, 2026

Last Modified

July 13, 2026

🔗 CVE IDs covered (1)

CVE-2026-9571 →

📋 Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-9571
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-4v7j-4mvr-5975