MFA Isn’t Foolproof: Here’re 5 Ways Hackers Bypass It (and What You Can Do)

Multi-Factor Authentication (MFA) is a critical defence layer… but it’s not invincible. If your agency relies on MFA alone to secure accounts, it’s worth knowing how hackers are still finding ways in.

Below, we explain seven common tactics used to bypass MFA and what you can do to stay ahead of them.

 

1. Session Hijacking

When you log in, your device receives a token that keeps you signed in. Hackers can steal that token, often through phishing or intercepting your connection, and gain access without ever needing your password or MFA code.

 

2. SIM Swapping

A social engineering attack where someone convinces a mobile provider to switch your phone number to a SIM card they control. If your MFA codes are texted to you, they’ll go straight to the attacker.

 

3. Phishing (Even with MFA)

Sophisticated phishing sites mimic real login pages. Users unknowingly enter their credentials, and MFA code, into these fake sites. The attacker captures the code and logs in at the same time as the user.

 

4. Compromised Third-Party Apps

Some apps connected to your account can become a weak link. If a hacker gains access to an app that’s already approved, MFA might be bypassed completely.

 

5. Malicious OAuth Apps

You know those “Sign in with Google/Microsoft” prompts? Attackers create fake versions. Granting permission means giving them access without needing your password.

 

6. Insider Threats

Not all risks are external. A disgruntled employee or someone with the wrong level of access can bypass protections and tamper with accounts – for example, by setting forwarding rules in email.

 

7. Weak MFA Implementation

MFA is only as strong as its setup. Relying on SMS alone, reusing the same factor twice (e.g. two app codes), or not reviewing settings regularly creates vulnerabilities.

So, what can you do?

  • Use stronger MFA methods (avoid SMS where possible; use authenticator apps or biometrics).
  • Educate teams – phishing training is still your best front line.
  • Review app permissions and connected devices regularly.
  • Adopt a Zero Trust approach – never assume trust, even inside your own network.
  • Monitor session activity – some breaches never touch the login screen.

Want Help Reducing MFA Risk?

Whether it’s reviewing app access, tightening cloud security, or improving user awareness, we’re here to support you.

Stay secure, stay collaborative. Don’t let MFA lull you into a false sense of safety.

Security is a process, not a setting.