Multifactor authentication (MFA) is a powerful security measure, but cybercriminals are finding increasingly sophisticated ways to bypass MFA protections. Understanding how attackers circumvent these controls is the first step toward building a stronger defense. In this article, we explore the most common techniques used to bypass MFA and provide practical strategies to protect your organization.
How cybercriminals bypass MFA
Cybercriminals use a variety of techniques to compromise MFA systems. Here are the three most common methods:
MFA fatigue
MFA fatigue, also known as push bombing, occurs when cybercriminals flood users with numerous authentication requests through push notifications. Overwhelmed by the constant bombardment, users may accidentally — or out of frustration — approve one of the requests. This gives attackers access without needing a password. A notable example occurred in 2022 when cybercriminals targeted Uber’s external contractor, repeatedly sending MFA requests until access was granted.
Phishing
In a phishing attack, cybercriminals pose as legitimate entities such as banks or IT support. They send deceptive messages that prompt users to provide their MFA codes. These messages often convey urgency — such as a warning of an account breach — to pressure users into acting without verifying authenticity. Once the attackers have the MFA code, they can bypass security systems and gain unauthorized access to accounts or sensitive data.
SIM swapping
Mobile devices are a primary means of receiving MFA codes, making them a prime target. In a SIM swapping attack, a cybercriminal convinces a mobile carrier to transfer a victim’s phone number to a new SIM card under their control. Once successful, the attacker intercepts MFA codes sent via SMS, allowing unauthorized access to the victim’s accounts.
Strategies to prevent MFA attacks
To protect your organization from attempts to bypass MFA, follow these strategies:
Use risk-based authentication
Implement risk-based authentication that dynamically adjusts security requirements based on user behavior. For example, if a user logs in from an unusual location or unknown device, the system can require additional verification. This adaptive approach raises security standards when it matters most.
Implement hardware-based MFA
Hardware security keys, such as those using Fast Identity Online (FIDO) protocols, provide stronger protection than software-based MFA. These physical devices generate unique authentication codes that are much harder to intercept or duplicate. Consider hardware-based MFA for highly sensitive applications to enhance your security posture.
Regularly review access rights
Grant users only the access they need. Regularly audit user permissions to ensure employees can only access the data and systems necessary for their roles. This limits the damage a compromised account can cause.
Strengthen password reset processes
Password reset procedures can be a weak link. Make sure your reset processes require users to verify their identity through more than one channel. This additional layer of security prevents attackers from exploiting reset procedures to gain unauthorized access.
Monitor high-value targets
Certain users — such as system administrators and HR personnel — possess elevated privileges that make them attractive targets. Pay close attention to the MFA protections surrounding these accounts and apply the strictest security measures available.
Stay ahead of emerging threats
Cybercriminals constantly evolve their tactics. Keep a close eye on new attack methods and proactively update your security measures to counter them. In addition, our cybersecurity services team can help you stay ahead of emerging threats with continuous monitoring and expert guidance.
Implementing these strategies can significantly bolster your company’s defenses and safeguard valuable assets from unauthorized access.
For a more comprehensive approach to cybersecurity, schedule a consultation with our experts today.