What is GHSA-496c-r634-6cgj?

GHSA-496c-r634-6cgj is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.7.x \u003c= 11.7.6, 10.11.x \u003c= 10.11.21 fail to prevent guest users from...

Which CVE IDs does GHSA-496c-r634-6cgj cover?

GHSA-496c-r634-6cgj covers the following CVE IDs: CVE-2026-16044. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-496c-r634-6cgj?

GHSA-496c-r634-6cgj has a CVSS v3 base score of 5.4, published by GitHub Security Advisories.

GHSA-496c-r634-6cgjMediumCVSS 5.4

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to prevent guest users from...

Vendor

GitHub Security Advisories

Published

August 17, 2026

Last Modified

August 17, 2026

🔗 CVE IDs covered (1)

CVE-2026-16044 →

📋 Description

Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to prevent guest users from receiving Board Admin privileges during board archive import which allows a board member to escalate a guest user to Board Admin via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00672

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-16044
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-496c-r634-6cgj