CVE-2025-53971

Name: CVE-2025-53971
Creator: NVD / NIST
Published: 2025-08-21T08:15:30.54+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 3.8/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2025-53971 is a low-severity vulnerability rated 3.8/10 on the CVSS scale. 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.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.8/10

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

EPSS Probability

0.19%

8.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	>= 9.11.0, < 9.11.18
Mattermost	Mattermost Server	>= 10.5.0, < 10.5.9

References

https://mattermost.com/security-updatesVendor Advisory

Timeline

Published: Aug 21, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-53971?

How severe is CVE-2025-53971?

CVE-2025-53971 has a CVSS score of 3.8/10 (LOW severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2025-53971?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-53971?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST