medium4.3
CVE-2025-11776
Mattermost fails to properly restrict access to archived channel search API
Impact
Mattermost versions < 11 fail to properly restrict access to archived channel search API which allows guest users to discover archived public channels via the `/api/v4/teams/{team_id}/channels/search_archived` endpoint
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250815165020-c8d66301415d | 8.0.0-20250815165020-c8d66301415d |
| go | github.com/mattermost/mattermost | < 5.3.2-0.20250815165020-c8d66301415d | 5.3.2-0.20250815165020-c8d66301415d |
| go | github.com/mattermost/mattermost-server | < 5.3.2-0.20250815165020-c8d66301415d | 5.3.2-0.20250815165020-c8d66301415d |
| go | github.com/mattermost/mattermost-server/v5 | < 5.3.2-0.20250815165020-c8d66301415d | 5.3.2-0.20250815165020-c8d66301415d |
| go | github.com/mattermost/mattermost-server/v6 | < 5.3.2-0.20250815165020-c8d66301415d | 5.3.2-0.20250815165020-c8d66301415d |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Server | before 11.0.0 |