CVE-2025-53971 LOW

CVE-2025-53971: Channel and Team Membership APIs inadvertently allow loss of Member privileges.

Vendor Mattermost
Product Mattermost
Weakness CWE-863 · Incorrect authorization
Published August 21, 2025
Last update August 21, 2025
View on NVD All CVEs

CVSS base score

3.8/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

August 21, 2025 CVE published
August 21, 2025 Record updated