Description
Mattermost versions <11.0 fail to properly enforce the "Allow users to view archived channels" setting which allows regular users to access archived channel content and files via the "Open in Channel" functionality from followed threads
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mattermost | Mattermost | <11.0 – ≤ <11.0 | 11.0.0 |
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 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | < 11.0.0-alpha.1 | 11.0.0-alpha.1 | GHSA-x3hx-ch7p-8xgg |
| Go | github.com/mattermost/mattermost-server | < 11.0.0-alpha.1+incompatible | 11.0.0-alpha.1+incompatible | GO-2025-4131 |
| Go | github.com/mattermost/mattermost-server/v5 | all versions | — | GO-2025-4131 |
| Go | github.com/mattermost/mattermost-server/v6 | all versions | — | GO-2025-4131 |
| Go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250815165020-c8d66301415d | 8.0.0-20250815165020-c8d66301415d | GHSA-x3hx-ch7p-8xgg |
Advisories 1
- openSUSE-SU-2026:21483-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Jul 31, 2026