AI startup hacks Anthropic, gains access to employee details, internal messages

Cybersecurity startup Cathedral, founded by former DOGE members, accessed sensitive Anthropic internal systems within 12 hours during a security test under Anthropic's outside-researcher programme, reaching employee information, salary details, job offers and internal messages, according to a draft report reviewed by The Washington Post. Anthropic confirmed access to a limited set of sales, HR and IT systems but said Claude conversations, model responses, source code and model weights were not reached, and that it shut off Cathedral's access the same day. The findings raised national security concerns in the Trump administration, while Anthropic said Cathedral overstated those implications and did not fully follow the testing programme's rules.