| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.5.0, < 10.5.9≥ 10.5.0+incompatible, < 10.5.9+incompatible≥ 9.11.0, < 9.11.18≥ 9.11.0+incompatible, < 9.11.18+incompatible | 10.5.910.5.9+incompatible9.11.189.11.18+incompatible |
| github.com/mattermost/mattermost-server/v5 | ≤ 5.39.3all versions | |
| github.com/mattermost/mattermost-server/v6 | ≤ 6.7.2all versions | |
| github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250721095846-c602a4a78e1f | 8.0.0-20250721095846-c602a4a78e1f |
| mattermost server | ≥ 10.5.0, < 10.5.9≥ 9.11.0, < 9.11.18 | 10.5.99.11.18 |
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.
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