Low severityNVD Advisory· Published Aug 21, 2025· Updated Aug 21, 2025
Channel and Team Membership APIs inadvertently allow loss of Member privileges.
CVE-2025-53971
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost-serverGo | >= 10.5.0, < 10.5.9 | 10.5.9 |
github.com/mattermost/mattermost-serverGo | >= 9.11.0, < 9.11.18 | 9.11.18 |
github.com/mattermost/mattermost/server/v8Go | < 8.0.0-20250721095846-c602a4a78e1f | 8.0.0-20250721095846-c602a4a78e1f |
github.com/mattermost/mattermost-server/v5Go | <= 5.39.3 | — |
github.com/mattermost/mattermost-server/v6Go | <= 6.7.2 | — |
Affected products
1- Range: 10.5.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/advisories/GHSA-4276-cm8c-788hghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-53971ghsaADVISORY
- mattermost.com/security-updatesghsaWEB
- pkg.go.dev/vuln/GO-2025-3902ghsaWEB
News mentions
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