CVE-2025-53971
Low
Description
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.
SeverityLow
CVSS3.8
Exploit probability—
Product
Mattermost Server
PublishedAug 21, 2025
First seenAug 21, 2025
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- mattermost mattermost_server9.11.18, 10.5.9 or later
- github.com/mattermost/mattermost-server10.5.9, 9.11.18, 9.11.18+incompatible, 10.5.9+incompatible or later
- github.com/mattermost/mattermost/server/v88.0.0-20250721095846-c602a4a78e1f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 9.11.0 ≤ v < 9.11.18, 10.5.0 ≤ v < 10.5.9 | 9.11.18, 10.5.9 |
| github.com/mattermost/mattermost-serverGo | 10.5.0 ≤ v < 10.5.9, 9.11.0 ≤ v < 9.11.18, 9.11.0+incompatible ≤ v < 9.11.18+incompatible, 10.5.0+incompatible ≤ v < 10.5.9+incompatible | 10.5.9, 9.11.18, 9.11.18+incompatible, 10.5.9+incompatible |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20250721095846-c602a4a78e1f | 8.0.0-20250721095846-c602a4a78e1f |
| github.com/mattermost/mattermost-server/v5Go | v ≤ 5.39.3, No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | v ≤ 6.7.2, No range specified | — |
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