| id: GO-2026-5173 |
| modules: |
| - module: github.com/mattermost/mattermost-server |
| vulnerable_at: 11.8.1+incompatible |
| - module: github.com/mattermost/mattermost-server/v5 |
| vulnerable_at: 5.39.3 |
| - module: github.com/mattermost/mattermost-server/v6 |
| vulnerable_at: 6.7.2 |
| - module: github.com/mattermost/mattermost/server/v8 |
| versions: |
| - introduced: 8.0.0-20260304132957-9f2616376582 |
| - fixed: 8.0.0-20260320113102-f2b3d1c6a945 |
| summary: Mattermost has an Incorrect Authorization issue in github.com/mattermost/mattermost-server |
| cves: |
| - CVE-2026-4055 |
| ghsas: |
| - GHSA-6cfr-wp44-6qmv |
| references: |
| - advisory: https://github.com/advisories/GHSA-6cfr-wp44-6qmv |
| - advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-4055 |
| - web: https://mattermost.com/security-updates |
| notes: |
| - fix: 'github.com/mattermost/mattermost/server/v8: could not add vulnerable_at: could not find tagged version between introduced and fixed' |
| source: |
| id: GHSA-6cfr-wp44-6qmv |
| created: 2026-06-25T01:52:27.136607473-04:00 |
| review_status: UNREVIEWED |
