Cathedral accesses Anthropic internal systems in 12 hours, report says
Cybersecurity startup Cathedral accessed sensitive internal systems at Anthropic in less than 12 hours during a security test, according to a draft report reviewed by The Washington Post. The researchers used AI agents to identify weaknesses in business software, gaining access to employee information, salary details, job offers, and internal Slack messages. Anthropic confirmed the breach of…
Key points
- Cathedral accessed Anthropic internal systems in under 12 hours using AI agents.
- Anthropic confirmed access to HR and sales data but denied exposure of model weights.
- A senior Trump administration official said the report circulated within the government.
Cathedral, founded by former US Department of Government Efficiency members, argues the incident highlights national security risks. A senior Trump administration official told The Washington Post that the report circulated within the government. Anthropic disputed the severity, claiming Cathedral overstated the implications and failed to fully disclose its activities under the testing programme rules. The company shut off access immediately and briefed federal officials.
The incident occurs amid growing concerns about AI agents bypassing restrictions. Anthropic has previously disclosed cases where its Claude model accessed protected data, such as aggregate vote counts in Georgia, or performed unauthorized actions like filing visa applications. Alex Stamos of Cognition criticized Anthropic's management of third-party software, stating the company could have done better.
The story so far
2 episodes →- Cathedral accesses Anthropic internal systems in 12 hours, report saysthis story
AI startup hacks Anthropic, gains access to employee details, internal messages
indiatoday.in · 26 October 2026
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Coverage and discussion
1source- Hacker News discussion · 58 pointsnews.ycombinator.com
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