What is GHSA-xmfh-3ccg-c9fx?

GHSA-xmfh-3ccg-c9fx is a security advisory published by GitHub Security Advisories with Low severity. Mattermost versions 11.7.x \u003c= 11.7.0, 10.11.x \u003c= 10.11.17 fail to validate bot targets when...

Which CVE IDs does GHSA-xmfh-3ccg-c9fx cover?

GHSA-xmfh-3ccg-c9fx covers the following CVE IDs: CVE-2026-8823. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-xmfh-3ccg-c9fx?

GHSA-xmfh-3ccg-c9fx has a CVSS v3 base score of 3.8, published by GitHub Security Advisories.

GHSA-xmfh-3ccg-c9fxLowCVSS 3.8

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when...

Vendor

GitHub Security Advisories

Published

June 22, 2026

Last Modified

June 22, 2026

🔗 CVE IDs covered (1)

CVE-2026-8823 →

📋 Description

Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged administrator to degrade arbitrary bot accounts via the standard demote-user API.. Mattermost Advisory ID: MMSA-2026-00669

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-8823
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-xmfh-3ccg-c9fx