Description
Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly enforce read permissions in search API endpoints which allows guest users without read permissions to access posts and files in channels via search API requests. Mattermost Advisory ID: MMSA-2025-00554
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | 11.3.0 – ≤ 11.3.0, 11.2.0 – ≤ 11.2.2, 10.11.0 – ≤ 10.11.10 | 11.4.0 |
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 | 0.0.20260326T203309-150000.1.155.2 | SUSE-SU-2026:1135-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | < 5.3.2-0.20260107142155-0481bd1fb045 | 5.3.2-0.20260107142155-0481bd1fb045 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0-rc1, < 10.11.11 | 10.11.11 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | >= 11.2.0-rc1, < 11.2.3 | 11.2.3 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | >= 11.3.0-rc1, < 11.3.1 | 11.3.1 | GHSA-cwfj-642j-gfh4 |
| Go | github.com/mattermost/mattermost-server | >= 10.11.0-rc1+incompatible, < 10.11.11+incompatible · >= 11.2.0-rc1+incompatible, < 11.2.3+incompatible · >= 11.3.0-rc1+incompatible, < 11.3.1+incompatible | 10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible | GO-2026-4745 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2026-4745 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2026-4745 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20260107142155-0481bd1fb045 | 8.0.0-20260107142155-0481bd1fb045 | GHSA-cwfj-642j-gfh4 |
Advisories 3
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-SU-2026:1135-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Mar 31, 2026
- WID-SEC-2026-0422 Mattermost: Mehrere Schwachstellen BSI CERT-Bund (WID) · Mar 19, 2026
References
- MMSA-2025-00554 vendor-advisory