Just now, a large-scale account security incident occurred at Anthropic, resulting in a significant number of Claude user accounts being forcibly logged off. The payment methods linked in the background, such as Visa and Mastercard, were also urgently cleared. According to the official statement, malicious actors utilized information-stealing malware to compromise Claude login sessions on users' computers, subsequently gaining access to accounts and stealing usage data. Currently, Anthropic has forcibly logged out users, removed payment methods, and refunded unauthorized charges, while urging users to change their credentials, revoke other sessions, and remove malware.