CVSS 3.1
3.8 lowCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:NCVE-2025-53971
Low (3.8) in mattermost mattermost server. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in github.com/mattermost/mattermost-server 10.5.9, 10.5.9+incompatible, 9.11.18.
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.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 10% of CVEs (scores of 2026-10-31)
- CWE
- CWE-863
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mattermost:mattermost_server
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4276-cm8c-788h | Go | github.com/mattermost/mattermost-server | >=10.5.0 <10.5.9 | 10.5.9 |
| GHSA-4276-cm8c-788h | Go | github.com/mattermost/mattermost-server | >=9.11.0 <9.11.18 | 9.11.18 |
| GHSA-4276-cm8c-788h | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250721095846-c602a4a78e1f | 8.0.0-20250721095846-c602a4a78e1f |
| GHSA-4276-cm8c-788h | Go | github.com/mattermost/mattermost-server/v5 | <=5.39.3 | no fix published |
| GHSA-4276-cm8c-788h | Go | github.com/mattermost/mattermost-server/v6 | <=6.7.2 | no fix published |
| GO-2025-3902 | Go | github.com/mattermost/mattermost-server | >=9.11.0+incompatible <9.11.18+incompatible >=10.5.0+incompatible <10.5.9+incompatible | 9.11.18+incompatible, 10.5.9+incompatible |
| GO-2025-3902 | Go | github.com/mattermost/mattermost-server/v5 | all versions | no fix published |
| GO-2025-3902 | Go | github.com/mattermost/mattermost-server/v6 | all versions | no fix published |
| GO-2025-3902 | Go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250721095846-c602a4a78e1f | 8.0.0-20250721095846-c602a4a78e1f |