An unauthorized group gained access to Anthropic's Mythos cybersecurity tool through a third-party vendor environment, allegedly on the day of its public announcement. The group accessed the tool using credentials of a vendor contractor employee and provided evidence to Bloomberg via screenshots and live demonstration. Anthropic is investigating but reports no evidence of impact to its own systems.
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Unauthorized group has gained access to Anthropic’s exclusive cyber tool Mythos, report claims
A vendor contractor's credentials were exploited to breach Anthropic's newly-announced Mythos cybersecurity tool on launch day, exposing supply-chain vulnerabilities in AI security products.
Tuesday, April 21, 2026 12:00 PM UTC2 MIN READSOURCE: TechCrunchBY sys://pipeline
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