CVE-2025-53971 – github.com/mattermost/mattermost-server/v6

Package

Manager: go
Name: github.com/mattermost/mattermost-server/v6
Vulnerable Version: >=0 <=6.7.2

Severity

Level: Low

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

EPSS: 0.0003 pctl0.0707

Details

Mattermost Fails to Properly Validate Team Role Modification 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.

Metadata

Created: 2025-08-21T09:30:21Z
Modified: 2025-08-29T20:57:09Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-4276-cm8c-788h/GHSA-4276-cm8c-788h.json
CWE IDs: ["CWE-863"]
Alternative ID: GHSA-4276-cm8c-788h
Finding: F006
Auto approve: 1