CVE-2025-11776
Medium
Description
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
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mattermost Server
PublishedNov 14, 2025
First seenNov 14, 2025
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- mattermost mattermost_server11.0.0 or later
- github.com/mattermost/mattermost/server/v88.0.0-20250815165020-c8d66301415d or later
- github.com/mattermost/mattermost5.3.2-0.20250815165020-c8d66301415d or later
- github.com/mattermost/mattermost-server5.3.2-0.20250815165020-c8d66301415d or later
- github.com/mattermost/mattermost-server/v55.3.2-0.20250815165020-c8d66301415d or later
- github.com/mattermost/mattermost-server/v65.3.2-0.20250815165020-c8d66301415d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | v < 11.0.0 | 11.0.0 |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20250815165020-c8d66301415d | 8.0.0-20250815165020-c8d66301415d |
| github.com/mattermost/mattermostGo | v < 5.3.2-0.20250815165020-c8d66301415d, No range specified | 5.3.2-0.20250815165020-c8d66301415d |
| github.com/mattermost/mattermost-serverGo | v < 5.3.2-0.20250815165020-c8d66301415d, No range specified | 5.3.2-0.20250815165020-c8d66301415d |
| github.com/mattermost/mattermost-server/v5Go | v < 5.3.2-0.20250815165020-c8d66301415d, No range specified | 5.3.2-0.20250815165020-c8d66301415d |
| github.com/mattermost/mattermost-server/v6Go | v < 5.3.2-0.20250815165020-c8d66301415d, No range specified | 5.3.2-0.20250815165020-c8d66301415d |
| github.com/mattermost/mattermost/v5Go | No range specified | — |
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