GitHub Advisoryadvisory · Go

GHSA-4276-cm8c-788h Mattermost Fails to Properly Validate Team Role Modification

LOW Published 2025-08-21 Modified 2025-08-29 Official page ↗
Aliases
CVE-2025-53971
Ecosystem
Go
Packages
github.com/mattermost/mattermost-server, github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server/v5, github.com/mattermost/mattermost-server/v6
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-863
Reviewed
2025-08-21

Affected packages

• Go github.com/mattermost/mattermost-server: >= 10.5.0, < 10.5.9 → fixed in 10.5.9 • Go github.com/mattermost/mattermost-server: >= 9.11.0, < 9.11.18 → fixed in 9.11.18 • Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20250721095846-c602a4a78e1f → fixed in 8.0.0-20250721095846-c602a4a78e1f • Go github.com/mattermost/mattermost-server/v5: <= 5.39.3 (no fix yet) • Go github.com/mattermost/mattermost-server/v6: <= 6.7.2 (no fix yet)

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.

Related

Alias · CVE (1)

  • CVE-2025-53971 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… vulnerability

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References