CVE-2025-53971

Published Aug 21, 2025

Last updated a year ago

CVSS low 3.8
web application

Overview

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.
Source
responsibledisclosure@mattermost.com
NVD status
Undergoing Analysis

Risk scores

CVSS 3.1

Type
Secondary
Base score
3.8
Impact score
2.5
Exploitability score
1.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Severity
LOW

Weaknesses

responsibledisclosure@mattermost.com
CWE-863

Social media

Hype score
Not currently trending

  1. CVE-2025-53971 Mattermost versions 10.5.x &lt;= 10.5.8, 9.11.x &lt;= 9.11.17 fail to properly validate authorization for team scheme role modifications which allows Team Admins to demote … https://t.co/1O03BHHxbK

    @CVEnew

    21 Aug 2025

    379 Impressions

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References

Sources include official advisories and independent security research.