UpHeron
All vulnerabilities

Servers and applications

CVE-2025-53971

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
Low 3.8
Published
21 Aug 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
9.11.18, 10.5.9
Sources
NVD

Affected software

SoftwareAffected versions
MattermostServers and applications · cpe:a:mattermost:mattermost_server
  • From 9.11.0 before 9.11.18
  • From 10.5.0 before 10.5.9

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-53971
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-53971