No Rate Limiting on Password Attempts After Insecure Registration Flow cause ATO

Summary

A security researcher identified an authentication vulnerability lacking rate limiting controls on password attempts. The flaw allowed unlimited brute force attacks against user accounts without triggering security measures like account lockouts or CAPTCHA challenges. Attackers could perform 100+ consecutive password attempts and distinguish successful authentications through session cookie presence in responses. This CWE-307 vulnerability enabled automated credential validation attacks, posing severe account takeover risks across our platform. Our development team successfully remediated the issue by implementing proper rate limiting mechanisms and security controls. We appreciate the researcher's comprehensive documentation and submission.