LIVE FEED
Infostealer Logs Expose AI Session Tokens That Bypass MFA

Infostealer Logs Expose AI Session Tokens That Bypass MFA

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 8.5 The Hacker News

Cybercriminals are harvesting JWT session tokens and API keys from infostealer logs to replay authentication against major AI platforms including OpenAI, Anthropic, and Google, effectively bypassing MFA entirely. Analysis of a 7 GB stealer dump revealed 1,843 unexpired tokens targeting AI services on the day of release, with 17.7% of all JWTs containing plaintext PII usable for follow-on social engineering. This attack pattern is particularly dangerous for AI platforms because stolen tokens grant full account access without triggering standard credential-based security controls.

Infostealer Malware Hijacks Claude Sessions via Cookie Theft

Infostealer Malware Hijacks Claude Sessions via Cookie Theft

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 7.2 BleepingComputer

Anthropic has confirmed that infostealer malware families including Vidar, LummaC2, StealC, and RedLine are being used to steal authenticated Claude browser sessions, granting attackers API-level access without needing credentials or 2FA. The attack bypasses standard authentication controls entirely by harvesting session cookies from compromised endpoints, allowing threat actors to consume victims' Claude usage quotas and potentially access stored payment data. Anthropic is revoking sessions and issuing refunds, but the incident highlights a systemic risk for AI service accounts when endpoint security is weak.

◉ AI THREAT BRIEFING

Stay ahead of the threat.

Twice-weekly digest of critical AI security developments — every story mapped to MITRE ATLAS and OWASP LLM Top 10. Free.

No spam. Unsubscribe anytime.