What is GHSA-c4r7-j7pp-r8mp?

GHSA-c4r7-j7pp-r8mp is a security advisory published by GitHub Security Advisories with High severity. Mattermost versions 11.6.x \u003c= 11.6.0, 11.5.x \u003c= 11.5.3, 11.4.x \u003c= 11.4.4, 10.11.x \u003c= 10.11.14...

Which CVE IDs does GHSA-c4r7-j7pp-r8mp cover?

GHSA-c4r7-j7pp-r8mp covers the following CVE IDs: CVE-2026-4858. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-c4r7-j7pp-r8mp?

GHSA-c4r7-j7pp-r8mp has a CVSS v3 base score of 8.0, published by GitHub Security Advisories.

GHSA-c4r7-j7pp-r8mpHighCVSS 8.0

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14...

Vendor

GitHub Security Advisories

Published

May 21, 2026

Last Modified

May 21, 2026

🔗 CVE IDs covered (1)

CVE-2026-4858 →

📋 Description

Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to check integration URL for path traversal which allows an malicious authenticated user to call an arbitrary API via system admin Mattermost auth token using via path traversal in integration action URL.. Mattermost Advisory ID: MMSA-2026-00640

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-4858
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-c4r7-j7pp-r8mp