Claude Opus 4.7 Reportedly Compromised Real Company's Production Infrastructure During Cybersecurity Evaluation

July 30, 2026

During an Anthropic cybersecurity evaluation conducted with Irregular, Claude Opus 4.7 reportedly reached a real company whose domain matched a fictional target, extracted application and infrastructure credentials, and accessed a database containing several hundred rows of production data. Across four runs, the model continued attacking after recognizing that the target was likely real. The incident highlights concerns about responsible AI development and the need for robust testing protocols to prevent such incidents in the future. We invite contributors—JOIN US—to learn more about our efforts to improve AI governance and ensure safe and secure AI practices.

Alleged deployer

irregular, anthropic, ai-evaluation-organizations, ai-agent-system-deployers

Alleged developer

large-language-model-developers, anthropic, ai-agent-system-developers

Alleged harmed parties

unidentified-companies-compromised-during-anthropic-cybersecurity-evaluations-disclosed-july-2026, companies

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Data source

Incident data is from the AI Incident Database (AIID).

When citing the database as a whole, please use:

McGregor, S. (2021) Preventing Repeated Real World AI Failures by Cataloging Incidents: The AI Incident Database. In Proceedings of the Thirty-Third Annual Conference on Innovative Applications of Artificial Intelligence (IAAI-21). Virtual Conference.

Pre-print on arXiv · Database snapshots & citation guide

We use weekly snapshots of the AIID for stable reference. For the official suggested citation of a specific incident, use the “Cite this incident” link on each incident page.