Cathedral Uses AI Agents to Breach Anthropic Internal Systems
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On October 28, 2026, The Decoder reported that cybersecurity startup Cathedral used AI agents to gain access to Anthropic's internal systems through its third-party business software. Cathedral said the entire operation took less than twelve hours, reaching content including meeting notes, salary data, job postings, and Slack messages. Cathedral subsequently submitted a report through Anthropic's own bug bounty program. The report said the two sides disagree on the scope of the incident's impact, but did not give the specifics of Anthropic's response. The situation is still developing.
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- The DecoderSelectedAI agents hacked Anthropic, maker of arguably the most capable AI models for cyberdefense
Cybersecurity startup Cathedral used AI agents to break into Anthropic's internal systems via third-party business software, saying that in under twelve hours it reached meeting notes, payroll data, job postings, and Slack messages, and filed its report through Anthropic's own bug bounty program.
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