Anthropic issues security alert: Malware has stolen some users' Claude sessions

📅 2026-08-31

Summary:

Anthropic is warning some Claude users that information-stealing malware on their computers has stolen active Claude login sessions, allowing attackers to access their accounts and steal usage data, bleepingcomputer reports.


"We have recently discovered that bad actors are using common information-stealing malware to steal Claude login sessions from users' computers and then use these login sessions to access Claude accounts and steal their usage data," Anthropic said in an email to affected users.

Foreign media said that the company is logging out affected users from Claude accounts, deleting saved payment methods, and refunding fees that it determines are unauthorized.

Anthropic urges affected users to take basic security measures, including changing credentials, revoking other sessions, and removing the malware from their computers.

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