A teenage whitehat hacker said he has found a simple way that attackers can bypass the two-factor authentication system PayPal uses to protect user accounts. The circumvention requires little more than spoofing a browser cookie set when users link their eBay and PayPal accounts, according to Joshua Rogers, a 17-year-old living in Melbourne, Australia. Once the cookie—which is tied to a function PayPal identifies as “=_integrated-registration”—is active in a user’s browsing session, the two-factor authentication is circumvented, Rogers reported. That means attackers who somehow acquire someone else’s login credentials would be able to log in without having to enter the one-time passcode sent to the account holder’s mobile phone.