CVE-2025-53971
August 21, 2025
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
github.com/mattermost/mattermost (GO):
Affected version(s) >=v9.11.0 <v9.11.18Fix Suggestion:
Update to version v9.11.18github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0 <v10.5.9Fix Suggestion:
Update to version v10.5.9github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v9.11.0 <v9.11.18Fix Suggestion:
Update to version v9.11.18github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20250721095846-c602a4a78e1fFix Suggestion:
Update to version v8.0.0-20250721095846-c602a4a78e1fgithub.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.9Fix Suggestion:
Update to version v10.5.9Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Incorrect Authorization
EPSS
Base Score:
0.04
