--- format: "aidr-story-markdown/v1" id: "21215e52d401f956c3edf234d6821b03dc3a99387dd68a7008776088558ad81d" canonical_url: "https://aidr.today/21215e52?lang=en" title: "Cathedral Researchers Breach Anthropic Systems on Day of IPO Filing" lang: "en" requested_lang: "en" available_langs: ["en","vi"] translation_fallback: null fallback_fields: [] published_at: "2026-10-26T14:52:43.000Z" category: "Industry" topics: ["anthropic","safety"] source_urls: ["https://marketbrief.now/cybersecurity/cathedral-researchers-breach-anthropic-systems-on-day-of-ipo-filing-8b674da9","https://x.com/lizzadwoskin/status/2114646230764851695","https://x.com/niubi/status/2114680504897150980","https://x.com/GerritD/status/2114729926771585121","https://x.com/Hesamation/status/2114730413482524918","https://x.com/hrkrshnn/status/2114718811492405706","https://x.com/ClementDelangue/status/2114713576296300604","https://huggingnews.com/cybersecurity/cathedral-researchers-breach-anthropic-systems-on-day-of-ipo-filing-8b674da9"] summary: "Cybersecurity startup Cathedral researchers accessed Anthropic employee salaries and internal meeting transcripts using AI agents and SaaS software connections, breaching the company's systems in under 12 hours on the same day Anthropic filed its S1 registration statement for an initial public offering." --- # Cathedral Researchers Breach Anthropic Systems on Day of IPO Filing > [Open the canonical story]() **Published:** 2026-10-26T14:52:43.000Z **Category:** Industry **Topics:** anthropic, safety ## Summary Cybersecurity startup Cathedral researchers accessed Anthropic employee salaries and internal meeting transcripts using AI agents and SaaS software connections, breaching the company's systems in under 12 hours on the same day Anthropic filed its S1 registration statement for an initial public offering\. ## Sources - [Story source]() - [Story source]() - [Story source]() - [Supporting source]() - [Supporting source]() - [Supporting source]() - [Supporting source]() - [Story source]()