Credential stuffing refers to attackers taking usernames and passwords stolen or leaked from one site to log into any other site for which an individual reused their credentials. Troy Hunt is the founder of the free Have I Been Pwned? breach-notification service. Hunt is a Microsoft Regional Director and MVP, Pluralsight author and internet security specialist. He has testified before the U.S. Congress on the impact data breaches are having on society. In a video interview at the 2018 Infosecurity Europe conference in London, Hunt discusses the rise in credential stuffing attacks.”]
Source: https://www.cuinfosecurity.com/credential-stuffing-attacks-how-to-combat-reused-passwords-a-11095