Mattermost versions 9.9.x <= 9.9.1, 9.5.x <= 9.5.7, 9.10.x <= 9.10.0 and 9.8.x <= 9.8.2 fail to restrict which roles can promote a user as system admin which allows a System Role with edit access to the permissions section of system console to update their role (e.g. member) to include the manage_system permission, effectively becoming a System Admin.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mattermost | Mattermost | 9.5.0 (including) | 9.5.8 (excluding) |
| Mattermost | Mattermost | 9.8.0 (including) | 9.8.3 (excluding) |
| Mattermost | Mattermost | 9.9.0 (including) | 9.9.2 (excluding) |
| Mattermost | Mattermost | 9.10.0 (including) | 9.10.1 (excluding) |