What is a Credential Stuffing Attack?

A credential stuffing attack is a specialized form of account takeover where cybercriminals use automated botnets to "stuff" millions of stolen username and password pairs into the login portals of unrelated websites. In the high-velocity threat environment of 2026, these attacks exploit a single human vulnerability: password reuse. For directors and officers, credential stuffing represents a massive fiduciary risk. A single compromised employee login can grant an attacker entry into corporate ERP systems or cloud environments, leading to data exfiltration that regulators often view as a failure of "duty of oversight." Effectively managing this automated threat requires shifting from simple perimeter defense to a comprehensive strategy of identity governance and robust insurance.