Anthropic signs out some Claude users, removes saved payment methods, and issues refunds after infostealer malware on their PCs hijacked sessions to drain usage (Mayank Parmar/BleepingComputer)

Anthropic disabled accounts for several Claude users, deleted stored payment information, and issued refunds after an infostealer malware infection on their computers hijacked sessions and drained API usage. The breach forced the company to remove compromised credentials and compensate affected customers.