In a credential stuffing attack, credentials are stolen from one site – typically a username and password – and then used to gain access to accounts on other sites. These cybercrimes take advantage of the fact that many people use the same usernames and passwords across multiple sites.
Cybercriminals gain access to login credentials by hacking into sites or purchasing credentials on the dark web. They then set up an automated bot to use this account information to log in elsewhere – gaining access to banking, government, health care or e-commerce sites.