bypassing-two-factor-and-otp

Start by capturing the send-code and verify-code requests, then submit a wrong code and intercept the response to flip status codes or JSON booleans like verified:false to true. If the application advances to the authenticated state, verification is enforced client-side only.

Use ffuf with a wordlist from 000000 to 999999 against the verify endpoint, filtering on failure responses. If rate limiting blocks you, test bypasses such as rotating X-Forwarded-For headers, changing User-Agent, or using fresh sessions per batch.

The workflow uses Burp Suite Professional for response interception, Turbo Intruder for single-packet race conditions, ffuf for high-rate brute forcing, and curl or httpie for manual parameter tampering. OWASP ZAP works as a free proxy alternative.

Yes, some applications return the actual code, a hash of it, or a debug field in the send-code response body, headers, or cookies. Inspecting the send OTP response for leaked codes provides a complete bypass with zero guessing.

A race condition fires many verify requests simultaneously using a single-packet attack so guesses land before the attempt counter or lockout is committed. Turbo Intruder in Burp Suite can queue multiple candidate codes and release them in one synchronized burst.

Only during authorized penetration tests with a written testing agreement or within bug bounty program scope. You need test accounts with controllable phone or email to receive legitimate codes for comparison against failure responses.