| id: GO-2026-5769 |
| modules: |
| - module: github.com/mattermost/mattermost-server |
| versions: |
| - introduced: 11.4.0+incompatible |
| - fixed: 11.4.4+incompatible |
| - introduced: 11.5.0+incompatible |
| - fixed: 11.5.2+incompatible |
| vulnerable_at: 11.5.2-rc3+incompatible |
| - module: github.com/mattermost/mattermost-server/v5 |
| non_go_versions: |
| - fixed: 5.3.2-0.20260327001745-7a339a6438f5 |
| 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: |
| - fixed: 8.0.0-20260327001745-7a339a6438f5 |
| summary: |- |
| Mattermost doesn't validate the X-Requested-With header on the burn-on-read |
| reveal endpoint in github.com/mattermost/mattermost-server |
| cves: |
| - CVE-2026-6339 |
| ghsas: |
| - GHSA-xvcx-mgpc-5xh3 |
| references: |
| - advisory: https://github.com/advisories/GHSA-xvcx-mgpc-5xh3 |
| - advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-6339 |
| - web: https://github.com/mattermost/mattermost/commit/7a339a6438f5a4a5feba6b8de887f17a1378b207 |
| - 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-xvcx-mgpc-5xh3 |
| created: 2026-06-25T15:04:07.226244319-04:00 |
| review_status: UNREVIEWED |
