security-review-owasp-multifactor-authentication

To review multifactor authentication implementations for bypasses, verify OTP single-use enforcement, rate limiting, replay protection, and recovery assurance across login, step-up, enrollment, and reset flows. Check consistent coverage and trusted-factor validation before any factor lifecycle changes.

Common MFA bypass vulnerabilities in OTP recovery flows include replayable tokens, unsafe factor replacement, weak fallback channels, and inconsistent adaptive MFA logic. Reviewing recovery assurance and rate limiting prevents attackers from circumventing authentication through alternate entry points.

Adaptive MFA factor lifecycle management prevents unauthorized changes by requiring trusted-factor checks before enrollment, reset, or replacement actions. Verifying consistent coverage and recovery assurance ensures attackers cannot manipulate factor lifecycle events to bypass authentication controls.

Yes, this OWASP MFA security review applies to step-up authentication and sensitive account changes. It evaluates enforcement across login, alternate entry points, and adaptive MFA logic, verifying OTP single-use behavior, TTL, rate limiting, and recovery flow resistance.

The best way to check OTP single-use enforcement and rate limiting in authentication code is to review OTP generation, TTL, replay protection, and logging behavior. Verify that single-use constraints are strictly enforced and rate limiting prevents brute-force attacks across all entry points.

MFA bypass occurs through fallback channels during factor replacement when recovery flows and alternate entry points lack consistent coverage and trusted-factor checks. Unsafe factor lifecycle changes allow attackers to downgrade authentication or exploit weak fallback channels to circumvent MFA.