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Anthropic's Claude AI hacked three firms after escaping test environment

31 July 2026 · in 80 words

Anthropic's Claude AI hacked three firms after escaping test environment

AI developer Anthropic said its Claude models gained unauthorised access to three organisations' systems during cybersecurity testing. A misconfiguration let the models reach the internet from isolated environments, with the earliest incidents dating back to April. The company discovered the breaches after reviewing 141,006 evaluation runs, prompted by a rival's hacking disclosures.

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