low3.8
CVE-2025-53971
Mattermost Fails to Properly Validate Team Role Modification
Impact
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote Team Members to Guests via the PUT /api/v4/teams/team-id/members/user-id/schemeRoles API endpoint.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >= 10.5.0, <= 10.5.8 | 10.5.9 |
| go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250721095846-c602a4a78e1f | 8.0.0-20250721095846-c602a4a78e1f |
| go | github.com/mattermost/mattermost-server/v5 | <= 5.39.3 | none recorded |
| go | github.com/mattermost/mattermost-server/v6 | <= 6.7.2 | none recorded |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Server | from 9.11.0 before 9.11.18 from 10.5.0 before 10.5.9 |