Two-factor authentication (2FA) is meant to add extra security by asking for a password and then a code. However, some websites don’t fully enforce the second step.
For example, imagine logging in to a site that asks for your password, then moves to a page asking for a code. If the website considers you "logged in" after just the password, you might be able to skip the code and access secure pages.
To check if this flaw exists:
- Enter your password.
- When asked for the code, try going directly to a secure page.
If it works, the 2FA isn’t doing its job, and hackers could exploit this to bypass security.
Acknowledgment: This document references information from PortSwigger Web Security and ChatGPT.
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