A wave of account takeover attacks involving artificial intelligence (AI) against major banks, including Shinhan, KB Kookmin and Hana, is testing their defenses and putting personal cybersecurity in the spotlight. Consumers have little control over breaches within companies. But the steps they take afterward can go a long way toward preventing exposed login details from putting their other financial and shopping accounts at risk. Security experts say two measures can substantially reduce the risk of account compromise — using a unique password for each service and enabling multifactor authentication. A key danger following a leak is credential stuffing. This involves using automated software to test usernames and passwords stolen from one platform across numerous others, from banking and retail websites to web portals and social networks. Attackers count on people using the same login details across multiple accounts for convenience. Generative AI and more advanced scripts have made these campaigns larger and more targeted. Criminals can make vast numbers of login attempts in a short p