VULNERABILITY INTELLIGENCE

CVE-2025-53971

CVSS score3.8 LOW
EPSS probability0.20%
CISA KEVNot currently listed
Published2025-08-21
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

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.

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-863

Primary references