MultiFactor Authentication for SilverStripe can bypass MFA during password reset flow

Description

### Impact In CMS 5, the password reset flow let a user with multi-factor authentication enabled change their password and get a logged-in session before completing multi-factor authentication. Exploiting this requires access to the user's email account. CMS 6 is not affected.

References

• https://github.com/advisories/GHSA-68wq-phq7-p2vg(advisory)
• https://github.com/silverstripe/silverstripe-mfa/security/advisories/GHSA-68wq-phq7-p2vg
• https://github.com/silverstripe/silverstripe-mfa/releases/tag/6.0.0
• https://www.silverstripe.org/download/security-releases/cve-2026-55186
• https://github.com/advisories/GHSA-68wq-phq7-p2vg

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