Anthropic Warns Claude Users of Infostealer Malware Infections
Summary
Anthropic warned some Claude users that infostealer malware (software that steals passwords and login information) on their computers allowed attackers to hijack their Claude accounts and run up usage charges. The company detected the malicious activity, signed out compromised sessions, removed saved payment methods from affected accounts, and refunded unauthorized charges. Users are advised to remove all malware from their computers before re-adding payment methods to their accounts.
Solution / Mitigation
Anthropic signed out affected sessions, removed saved payment methods from compromised accounts, and refunded any Claude charges identified as unauthorized. The company also warned it may sign users out again if further account misuse is detected. Users should ensure all malware is removed from their computers before re-adding a payment method to their account.
Classification
Affected Vendors
Related Issues
Original source: https://www.securityweek.com/anthropic-warns-claude-users-of-infostealer-malware-infections/
First tracked: August 31, 2026 at 02:01 PM
Classified by LLM (prompt v3) · confidence: 95%