Credential Stuffing

What is Credential Stuffing?

Credential stuffing exploits the common habit of password reuse. Attackers take credentials leaked from one breach and automatically try them against other services. Unlike brute force, credential stuffing uses real credentials, making it harder to detect. It is effective because many users reuse passwords across services. Defense includes multi-factor authentication, monitoring for anomalous login patterns, and checking passwords against known breach databases.