What is GHSA-m2w9-h2mm-79qr?

GHSA-m2w9-h2mm-79qr is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.6.x \u003c= 11.6.1, 11.5.x \u003c= 11.5.4, 10.11.x \u003c= 10.11.15, 10.11.x \u003c= 10.11.16...

Which CVE IDs does GHSA-m2w9-h2mm-79qr cover?

GHSA-m2w9-h2mm-79qr covers the following CVE IDs: CVE-2026-6739. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-m2w9-h2mm-79qr?

GHSA-m2w9-h2mm-79qr has a CVSS v3 base score of 6.7, published by GitHub Security Advisories.

GHSA-m2w9-h2mm-79qrMediumCVSS 6.7

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16...

Vendor

GitHub Security Advisories

Published

June 12, 2026

Last Modified

June 12, 2026

🔗 CVE IDs covered (1)

CVE-2026-6739 →

📋 Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API.. Mattermost Advisory ID: MMSA-2026-00656

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-6739
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-m2w9-h2mm-79qr