What is GHSA-2g8v-grq3-hq2g?

GHSA-2g8v-grq3-hq2g 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-2g8v-grq3-hq2g cover?

GHSA-2g8v-grq3-hq2g covers the following CVE IDs: CVE-2026-5139. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-2g8v-grq3-hq2g?

GHSA-2g8v-grq3-hq2g has a CVSS v3 base score of 5.4, published by GitHub Security Advisories.

GHSA-2g8v-grq3-hq2gMediumCVSS 5.4

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-2026-5139 →

📋 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 enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler, which allows any authenticated user to overwrite the global default GitLab instance configuration via the {{/gitlab connect }} slash command.. Mattermost Advisory ID: MMSA-2026-00644

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-5139
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-2g8v-grq3-hq2g