What is GHSA-jqgv-39mg-7c2r?

GHSA-jqgv-39mg-7c2r 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-jqgv-39mg-7c2r cover?

GHSA-jqgv-39mg-7c2r covers the following CVE IDs: CVE-2026-6673. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-jqgv-39mg-7c2r?

GHSA-jqgv-39mg-7c2r has a CVSS v3 base score of 6.4, published by GitHub Security Advisories.

GHSA-jqgv-39mg-7c2rMediumCVSS 6.4

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-2026-6673 →

📋 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 authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-6673
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-jqgv-39mg-7c2r