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CVE-2025-53971

Good to know:

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Date: 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.

Severity Score

Related Resources (6)

https://github.com/mattermost/mattermost
https://nvd.nist.gov/vuln/detail/CVE-2025-53971
https://mattermost.com/security-updates
https://github.com/advisories/GHSA-4276-cm8c-788h
https://pkg.go.dev/vuln/GO-2025-3902
https://www.mend.io/vulnerability-database/CVE-2025-53971

Severity Score

Weakness Type (CWE)

Incorrect Authorization

CWE-863

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost - v9.11.18;github.com/mattermost/mattermost - v10.5.9;github.com/mattermost/mattermost-server - v10.5.9;github.com/mattermost/mattermost-server - v9.11.18;github.com/mattermost/mattermost/server/v8 - v8.0.0-20250721095846-c602a4a78e1f

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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