Single Sign-On (SSO) is an authentication method that enables users to securely authenticate with multiple applications and websites by using just one set of credentials. SSO works based on relationships …
When hackers are in possession of a large set of usernames and passwords, they perform credential stuffing attacks on popular websites, slowly enough to evade failed password login monitoring solutions. Over time they will amass a treasure trove of compromised credentials which they can sell on the dark web for a tidy profit or they can use those credentials to cause significant damage to the original account holder.