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The Login V1 MFA init/enrollment handlers acted on authReq.UserID via setUserContext without verifying the auth request had completed its first factor. A request that only submitted a loginname could enroll TOTP/SMS/Email/U2F factors and overwrite the victim's phone number, and the discrepant errors bypassed IgnoreUnknownUsernames. Gate the enrollment handlers on PossibleSteps[0] == *domain.MFAPromptStep, which nextSteps only yields after firstFactorChecked passes. Co-authored-by: Claude Opus 4.8 <[email protected]>