A security flaw in PayPalsauthentication systemallows an attacker to gain access to an account that has two-factor authentication (2FA) turned on without having to enter the second validation code.A 17-year-old from Australia discovered that when linking an eBay account with a PayPal one, there is the possibility to log into the latter bypassing the 2FA feature.2FA is a security measure imposed by many online services to make sure that the owner of the account is the one log…