CVE-2025-27538: Mattermost Missing Authentication for Critical Function

April 16, 2025 (updated April 23, 2025)

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.

References

github.com/advisories/GHSA-j5jw-m2ph-3jjf
github.com/mattermost/mattermost
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-27538
pkg.go.dev/vuln/GO-2025-3620

Code Behaviors & Features

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