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Multifactor authentication (MFA) is a critical defense, but it’s not immune to exploitation. Before we dive into prevention strategies, let’s quickly revisit what MFA is and why attackers are targeting it.
What Is Multifactor Authentication?
MFA is one of the most powerful tools available to protect user accounts. By requiring a second form of verification beyond just a username and password, MFA adds a critical layer of defense against unauthorized access — but like any security tool, it’s not foolproof. Cybercriminals are increasingly using sophisticated methods to get around it.
Below are three essential tips to help your organization prevent MFA exploitation.
Explore our webinar on multifactor authentication to learn how to strengthen your MFA strategy.
3 Essential Tips to Stop MFA Bypass Attacks
1. Only Approve Sign-In Requests You Initiated
MFA prompts should never come as a surprise. If you receive an authentication request and you’re not actively trying to sign in, do not approve it. This could indicate that someone is attempting to access your account using stolen credentials. Instead, deny the request and alert your information technology (IT) or security team immediately.
This type of scenario is more successful for an attacker than most organizations believe due to MFA fatigue, in which attackers bombard users with repeated MFA prompts, hoping one gets approved. Your awareness is your first line of defense.
2. Never Share MFA Codes
Whether it’s a one-time code sent via text message, email, or an authentication app, it is meant for you and only you. Sharing an MFA code — even with someone who appears trustworthy — can lead to a full account takeover.
Cybercriminals often impersonate trusted contacts, such as IT support or vendors, using email, phone calls, or text messages to trick you into revealing your MFA code. If anyone asks for your code, it’s a red flag. Don’t share it — report it.
3. Recognize and Report Phishing Sites
One of the most common MFA bypass methods is phishing — specifically, spoofing legitimate login pages. Attackers use tools like Evilginx to create fake login portals that capture your credentials and MFA token in real time.
Always check the URL of any login page before entering credentials. When in doubt, navigate to the site directly rather than clicking on a link from an email or message. Report any suspicious login pages or activity to your security team.
To dive deeper into real-world tactics used by cybercriminals and how to defend against them, explore our Hacker Hour episode on how bad guys bypass MFA.
Stay Ahead of MFA Bypass Techniques
Understanding how attackers bypass MFA is the first step in preventing it. In addition to these tips, organizations should invest in:
- Ongoing security awareness programs: Teach employees how to recognize suspicious behavior and avoid social engineering traps.
- Behavior-based monitoring tools: Detect anomalies in login patterns and user activity in real time.
- Secure session management practices: Limit session duration, implement auto-logout on inactivity, and regularly refresh tokens.
While MFA is a critical layer of protection, it works best as part of a broader cybersecurity strategy. Combining technical controls with informed users is the key to reducing risk.
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