web-vuln-mfa-bypass

Testing MFA bypass vulnerabilities involves simulating OTP submissions and verifying post-MFA access controls across TOTP, SMS, email, or push-based flows. This identifies flaws like missing rate limiting, OTP reuse, response manipulation, and race conditions.

Common MFA bypass vulnerabilities include missing rate limiting, OTP reuse, response manipulation, direct navigation to post-MFA pages, backup code handling flaws, predictable OTP values, and client-side MFA state storage exposure.

Yes, you can test OTP rate limiting and race conditions using standard tooling such as curl and optionally GNU Parallel. These tools simulate concurrent or rapid OTP submissions to identify missing rate limits and race condition vulnerabilities.

Yes, you need a valid MFA-enrolled account and an isolated test environment to safely map the MFA flow, identify verification endpoints, and validate access controls without impacting production users.

The best way to check for direct navigation bypasses is to map the MFA flow to identify verification endpoints and parameter names, then attempt direct access to post-MFA pages to validate access controls and session fixation vulnerabilities.

Client-side MFA state storage poses a security risk because it exposes MFA state to the user, allowing potential manipulation to bypass verification. Assessing this exposure reveals bypass vectors and weaknesses in response integrity.