What is GHSA-2xf7-hmf6-p64j?

GHSA-2xf7-hmf6-p64j is a security advisory published by GitHub Security Advisories with Low severity. Mattermost doesn't properly validate channel membership at the time of data retrieval

Which CVE IDs does GHSA-2xf7-hmf6-p64j cover?

GHSA-2xf7-hmf6-p64j covers the following CVE IDs: CVE-2026-20796. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-2xf7-hmf6-p64j?

GHSA-2xf7-hmf6-p64j has a CVSS v3 base score of 3.1, published by GitHub Security Advisories.

Which products are affected by GHSA-2xf7-hmf6-p64j?

GHSA-2xf7-hmf6-p64j affects 1 product, including: go/github.com/mattermost/mattermost-server:\u003e= 10.11.0, \u003c= 10.11.9.

GHSA-2xf7-hmf6-p64jLowCVSS 3.1

Mattermost doesn't properly validate channel membership at the time of data retrieval

Vendor

GitHub Security Advisories

Published

February 13, 2026

Last Modified

February 13, 2026

🔗 CVE IDs covered (1)

CVE-2026-20796 →

📋 Description

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549

🎯 Affected products1

go/github.com/mattermost/mattermost-server:>= 10.11.0, <= 10.11.9

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-20796
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-2xf7-hmf6-p64j