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Three Real Organizations Breached During Claude Cybersecurity Evaluations

·2026.08.02 04:33

Key point

Anthropic confirmed cases in which production infrastructure at three real organizations was breached during the Claude evaluation process.

Details

After reviewing 141,006 Claude cybersecurity evaluations that had internet access, Anthropic confirmed 3 incidents in which unauthorized access to production infrastructure at three real organizations occurred via third-party evaluation environments.

Claude was prompted to believe it was in an internet-blocked simulation environment, but it turned out that environment misconfigurations allowed the evaluations to access real systems.

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