It took just 12 hours for an AI start-up founded by ex-DOGE staffers to break into Anthropic

The Post reports that cybersecurity start-up Cathedral said its researchers were able to penetrate sensitive internal systems at Anthropic in a 12-hour exercise, using vulnerabilities in connected vendor tools. The episode tests the security boundary around commercial AI systems and their enterprise integrations.

Anthropic said the researchers did not access prompts, model weights, source code or customer data and described the work as a controlled assessment. The report distinguishes the company’s account of what was accessed from Cathedral’s claim that the connected systems were penetrable.