CVE-2025-27538

MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users

Description

Mattermost versions 10.5.x <= 10.5.1, 9.11.x <= 9.11.9 fail to enforce MFA checks in PUT /api/v4/users/user-id/mfa when the requesting user differs from the target user ID, which allows users with edit_other_users permission to activate or deactivate MFA for other users, even if those users have not set up MFA.

Remediation

Solution:

  • Update Mattermost to versions 10.6.0, 10.5.2, 9.11.10 or higher.

Category

2.2
CVSS
Severity: Low
CVSS 3.1 •
EPSS 0.03%
Affected: Mattermost Mattermost
Published at:
Updated at:

References

Link Tags
https://mattermost.com/security-updates

Frequently Asked Questions

What is the severity of CVE-2025-27538?
CVE-2025-27538 has been scored as a low severity vulnerability.
How to fix CVE-2025-27538?
To fix CVE-2025-27538: Update Mattermost to versions 10.6.0, 10.5.2, 9.11.10 or higher.
Is CVE-2025-27538 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-27538 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-27538?
CVE-2025-27538 affects Mattermost Mattermost.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.