What’s Vulnerable › Vulnerabilities
CVE-2025-27538: MFA Enforcement Bypass Allows Unauthorized Removal of MFA for Other Users
- Severity: low (CVSS 2.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-04-16 · updated 2026-06-17
- Weakness: CWE-306
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.
Affected products
- Mattermost: from 9.11.0 before 9.11.10; from 10.5.0 before 10.5.2 — fixed in 10.5.2, 9.11.10
How to fix
Upgrade to a fixed version: Mattermost 10.5.2, 9.11.10. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2025-27538 or the next vulnerability affects your stack