One Password, a Thousand Doors: Understanding the Credential Stuffing Threat and How to Shut It Down
Hackers are not guessing your passwords — they already have them. Credential stuffing attacks use leaked login databases to test billions of username-and-password combinations against popular services every single day, and password reuse makes the strategy brutally effective. This guide explains how these attacks work, why they keep succeeding, and what multi-factor authentication actually does to stop them.