What is GHSA-8qq9-cqj8-82w4?

GHSA-8qq9-cqj8-82w4 is a security advisory published by GitHub Security Advisories with High severity. Mattermost versions 11.6.x \u003c= 11.6.1, 11.5.x \u003c= 11.5.4, 10.11.x \u003c= 10.11.15, 10.11.x \u003c= 10.11.16...

Which CVE IDs does GHSA-8qq9-cqj8-82w4 cover?

GHSA-8qq9-cqj8-82w4 covers the following CVE IDs: CVE-2026-6961. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-8qq9-cqj8-82w4?

GHSA-8qq9-cqj8-82w4 has a CVSS v3 base score of 7.6, published by GitHub Security Advisories.

GHSA-8qq9-cqj8-82w4HighCVSS 7.6

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16...

Vendor

GitHub Security Advisories

Published

June 12, 2026

Last Modified

June 12, 2026

🔗 CVE IDs covered (1)

CVE-2026-6961 →

📋 Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-6961
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-8qq9-cqj8-82w4