GHSA-4276-cm8c-788hLowCVSS 3.8

Mattermost Fails to Properly Validate Team Role Modification

Published
August 21, 2025
Last Modified
August 29, 2025

🔗 CVE IDs covered (1)

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 products5

  • go/github.com/mattermost/mattermost-server:>= 10.5.0, <= 10.5.8
  • go/github.com/mattermost/mattermost-server:>= 9.11.0, <= 9.11.17
  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20250721095846-c602a4a78e1f
  • go/github.com/mattermost/mattermost-server/v5:<= 5.39.3
  • go/github.com/mattermost/mattermost-server/v6:<= 6.7.2

🔗 References (4)