Stolen Claude sessions can reach corporate Gmail | VentureBeat
Infostealers replayed stolen Claude session cookies into paid accounts without ever touching the login page two-factor authentication guards.
The accounts Anthropic flagged were card-billed, self-serve accounts, which is the population no corporate identity provider governs, and no admin console can sign out. Session-cookie replay bypasses SSO as thoroughly as it bypasses 2FA. What SSO provides here is revocation and visibility, not prevention. The company disclosed the campaign in notification emails to affected users, named six stealer families, signed the accounts out, stripped the saved payment methods, and refunded the charges it found.
The burned usage is the small loss. What those sessions could reach is the exposure, and none of it sat behind an identity controlled by an enterprise.
Anthropic told affected users that a bad actor was using common infostealer malware to lift Claude login sessions off their computers and then replaying them to burn the accounts' usage, according...
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