Description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.8.0 – ≤ 10.8.3, 10.5.0 – ≤ 10.5.8, 9.11.0 – ≤ 9.11.17, 10.9.0 – ≤ 10.9.2, 10.10.0 – ≤ 10.10.0 | 10.11.0 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 10.8.0, < 10.8.4 | 10.8.4 | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost-server | >= 10.5.0, < 10.5.9 | 10.5.9 | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost-server | >= 9.11.0, < 9.11.18 | 9.11.18 | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost-server | >= 10.9.0, < 10.9.3 | 10.9.3 | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost-server | >= 10.10.0, < 10.10.1 | 10.10.1 | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost-server | >= 9.11.0+incompatible, < 9.11.18+incompatible · >= 10.5.0+incompatible, < 10.5.9+incompatible · >= 10.8.0+incompatible, < 10.8.4+incompatible · >= 10.9.0+incompatible, < 10.9.3+incompatible · >= 10.10.0+incompatible, < 10.10.1+incompatible | 9.11.18+incompatible, 10.5.9+incompatible, 10.8.4+incompatible, 10.9.3+incompatible, 10.10.1+incompatible | GO-2025-3904 |
| Go | github.com/mattermost/mattermost-server/v5 | <= 5.39.3 | — | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-3904 |
| Go | github.com/mattermost/mattermost-server/v6 | <= 5.7.2 | — | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-3904 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250708173752-d6b35c41f0ae5 | 8.0.0-20250708173752-d6b35c41f0ae5 | GHSA-q453-638c-h4mr |
| Go | github.com/mattermost/mattermost/server/v8 | all versions | — | GO-2025-3904 |
Advisories 1
- WID-SEC-2025-1625 Mattermost Server und Plugins: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 21, 2025