<doc fingerprint="bc199951990975d5"> Two-part blog series covering Multi-Factor Authentication (MFA) definition, attacker methods to bypass MFA, adversary-in-the-middle techniques growth, and actionable ways to prevent MFA bypass. MFA combines factors such as something you know, have, or are, to provide an additional layer of protection beyond traditional password-based systems. However, attackers continue to develop sophisticated methods to bypass MFA by exploiting gaps in implementation, human error, or technical vulnerabilities. Key attacker approaches include conditional access policy, machine-based attacks, phishing and social engineering, phone-based attacks, and insider threats. These methods can be exploited through IP address whitelisting, geo-whitelisting, user-agent whitelisting, cloud tooling bypasses, non-MFA hosts, session token theft, OTPs and seed QR codes exploitation, biometrics and TPMs compromise, stolen devices, phishing and social engineering, phone-based attacks, QR phishing, and insider threats. To prevent MFA bypass, organizations must implement effective security measures, including conditional access policy configurations, machine learning-powered threat detection, phishing and social engineering training, phone-based authentication methods, and insider threat mitigation strategies. Staying informed about emerging threats and vulnerabilities is essential to maintaining the effectiveness of MFA systems. </doc>