What is GHSA-j89q-r2jw-jrj5?

GHSA-j89q-r2jw-jrj5 is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost versions 11.9.x \u003c= 11.9.0, 11.8.x \u003c= 11.8.4, 11.7.x \u003c= 11.7.7, 10.11.x \u003c= 10.11.22...

Which CVE IDs does GHSA-j89q-r2jw-jrj5 cover?

GHSA-j89q-r2jw-jrj5 covers the following CVE IDs: CVE-2026-14259. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-j89q-r2jw-jrj5?

GHSA-j89q-r2jw-jrj5 has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

GHSA-j89q-r2jw-jrj5MediumCVSS 4.3

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22...

Vendor

GitHub Security Advisories

Published

September 14, 2026

Last Modified

September 14, 2026

🔗 CVE IDs covered (1)

CVE-2026-14259 →

📋 Description

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to enforce board creation permissions when importing archive files which allows an authenticated non-guest team member to create Open or Private boards despite administrator restrictions via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00712

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-14259
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-j89q-r2jw-jrj5