Description
Mattermost versions 10.11.x <= 10.11.9 fail to enforce invite permissions when updating team settings, which allows team administrators without proper permissions to bypass restrictions and add users to their team via API requests. Mattermost Advisory ID: MMSA-2025-00561
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 10.11.0 – ≤ 10.11.9 | 11.3.0 |
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.
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 | 0.0.20260226T182644-150000.1.149.1 | SUSE-SU-2026:0757-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | >= 11.1.0 | — | GHSA-cgjg-p2m2-qm4p |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0 | — | GHSA-cgjg-p2m2-qm4p |
| Go | github.com/mattermost/mattermost-server | >= 11.2.0 | — | GHSA-cgjg-p2m2-qm4p |
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20251215190648-6404ab29acc0 | 5.3.2-0.20251215190648-6404ab29acc0 | GHSA-cgjg-p2m2-qm4p |
| Go | github.com/mattermost/mattermost-server | all versions | — | GO-2026-4523 |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0+incompatible | — | GO-2026-4523 |
| Go | github.com/mattermost/mattermost-server | >= 11.1.0+incompatible | — | GO-2026-4523 |
| Go | github.com/mattermost/mattermost-server | >= 11.2.0+incompatible | — | GO-2026-4523 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2026-4523 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2026-4523 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20251215190648-6404ab29acc0 | 8.0.0-20251215190648-6404ab29acc0 | GHSA-cgjg-p2m2-qm4p |
Advisories 2
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:0757-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 4, 2026
References
- MMSA-2025-00561 vendor-advisory