CVE-2025-53971

Published: Aug 21, 2025

Modified: Aug 21, 2025

PUBLISHED

CVSS v3.1

3.8

LOW

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.

Vendor	Product	Versions
Mattermost	Mattermost	affected `10.5.0 - <= 10.5.8` affected `9.11.0 - <= 9.11.17` unaffected `10.10.0` unaffected `10.5.9` unaffected `9.11.18`

Weaknesses (CWE)

CWE-863

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

References

https://mattermost.com/security-updates

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CVE-2025-53971

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References