CVE-2025-53971

LOW EPSS 8.7%
Published Aug 21, 202510mo ago · Modified Jun 17, 20261w ago
3.8 CVSS 3.1
Low
Find Similar
Published Aug 21, 2025 10mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
3.8
Exploitability
1.2
Impact
2.5
Vector string
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

Threat Intelligence

EPSS Exploit Probability
8.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-863 Incorrect Authorization Authorization

Affected Products 2

VendorProductVersionRange
mattermostmattermost_server*≥9.11.0  –  <9.11.18
mattermostmattermost_server*≥10.5.0  –  <10.5.9

References 1

  • mattermost.com https://mattermost.com/security-updates
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.