Description
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.5.0 – ≤ 10.5.8, 9.11.0 – ≤ 9.11.17 | 10.11.0 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | govulncheck-vulndb | 0.0.20251023T162509-150000.1.110.1 | SUSE-SU-2025:3799-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | govulncheck-vulndb | 0.0.20250924T192141-1.1 | openSUSE-SU-2025:15576-1 |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20251023T162509-150000.1.110.1 | SUSE-SU-2025:3799-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-plugin-boards | < 0.0.0-20250716054606-3f3e3becfe1d | 0.0.0-20250716054606-3f3e3becfe1d | GHSA-f72g-52v7-mg3p |
| Go | github.com/mattermost/mattermost-server | >= 10.5.0-rc1, < 10.5.9 | 10.5.9 | GHSA-f72g-52v7-mg3p |
| Go | github.com/mattermost/mattermost-server | >= 9.11.0-rc1, < 9.11.18 | 9.11.18 | GHSA-f72g-52v7-mg3p |
| Go | github.com/mattermost/mattermost-server | >= 9.11.0-rc1+incompatible, < 9.11.18+incompatible · >= 10.5.0-rc1+incompatible, < 10.5.9+incompatible | 9.11.18+incompatible, 10.5.9+incompatible | GO-2025-3978 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-3978 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-3978 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250721095935-11c36f4d1e44 | 8.0.0-20250721095935-11c36f4d1e44 | GHSA-f72g-52v7-mg3p |
Advisories 4
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- openSUSE-SU-2025:15576-1 govulncheck-vulndb-0.0.20250924T192141-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:3799-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1856 Mattermost Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 22, 2025