What is GHSA-6cfr-wp44-6qmv?

GHSA-6cfr-wp44-6qmv is a security advisory published by GitHub Security Advisories with Medium severity. Mattermost has an Incorrect Authorization issue

Which CVE IDs does GHSA-6cfr-wp44-6qmv cover?

GHSA-6cfr-wp44-6qmv covers the following CVE IDs: CVE-2026-4055. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-6cfr-wp44-6qmv?

GHSA-6cfr-wp44-6qmv has a CVSS v3 base score of 4.3, published by GitHub Security Advisories.

Which products are affected by GHSA-6cfr-wp44-6qmv?

GHSA-6cfr-wp44-6qmv affects 1 product, including: go/github.com/mattermost/mattermost/server/v8:\u003e= 8.0.0-20260304132957-9f2616376582, \u003c 8.0.0-20260320113102-f2b3d1c6a945.

GHSA-6cfr-wp44-6qmvMediumCVSS 4.3

Mattermost has an Incorrect Authorization issue

Vendor

GitHub Security Advisories

Published

May 21, 2026

Last Modified

June 23, 2026

🔗 CVE IDs covered (1)

CVE-2026-4055 →

📋 Description

Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629.

🎯 Affected products1

go/github.com/mattermost/mattermost/server/v8:>= 8.0.0-20260304132957-9f2616376582, < 8.0.0-20260320113102-f2b3d1c6a945

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-4055
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-6cfr-wp44-6qmv