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Investigating three real-world incidents in our cybersecurity evaluations

Anthropic's initial disclosure of three Claude cyber-evaluation runs that reached real third-party systems because an evaluation environment had unintended internet access.

Published
Jul 30, 2026
Accessed
Sep 14, 2026
Publisher
Anthropic
Source type
primary
Version
2026-07-30
Rights
Public web source; citation and short excerpt only.

Each support, contradiction or context label applies to a cited Claim, not to a whole Case.

Source record

Anthropic reviewed 141,006 evaluation runs and reported three incidents involving unauthorized access to real organizations.

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Claim-level citations (1)

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DiggingBeagle. “Investigating three real-world incidents in our cybersecurity evaluations.” Published Jul 30, 2026 · Accessed Sep 14, 2026. https://diggingbeagle.com/sources/investigating-three-real-world-incidents-in-our-cybersecurity-evaluations/

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