Description
Mattermost versions 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to validate the user permission when accessing the files and subscribing to the block in Boards, which allows an authenticated user to access other board files and was able to subscribe to the block from other boards that the user does not have access to
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.11.0 – ≤ 10.11.4, 10.5.0 – ≤ 10.5.12 | 11.1.0 |
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 | 0.0.20251209T172047-150000.1.127.1 | SUSE-SU-2025:4395-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260723T184607-160000.1.1 | openSUSE-SU-2026:21483-1 |
| openSUSE Leap 15.6 | govulncheck-vulndb | 0.0.20251209T172047-150000.1.127.1 | SUSE-SU-2026:0037-1, SUSE-SU-2025:4395-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost | >= 10.11.0, < 10.11.5 | 10.11.5 | GHSA-58w6-w55x-6wq8 |
| Go | github.com/mattermost/mattermost | >= 10.5.0, < 10.5.13 | 10.5.13 | GHSA-58w6-w55x-6wq8 |
| Go | github.com/mattermost/mattermost | >= 10.5.0+incompatible, < 10.5.13+incompatible · >= 10.11.0+incompatible, < 10.11.5+incompatible | 10.5.13+incompatible, 10.11.5+incompatible | GO-2025-4178 |
| Go | github.com/mattermost/mattermost-server | all versions | — | GO-2025-4178 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-4178 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-4178 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250905150616-ba86dfc5876b | 8.0.0-20250905150616-ba86dfc5876b | GHSA-58w6-w55x-6wq8 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20251212204551-54f2e9b4afd5 | 8.0.0-20251212204551-54f2e9b4afd5 | GO-2025-4178 |
Advisories 4
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:0037-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4395-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 23, 2026
- WID-SEC-2025-2715 Mattermost Server: Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Dec 1, 2025