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AI Startup Finds Paths Into Anthropic's Business Systems in Under 12 Hours

The exercise revealed that common third‑party HR and sales software can give rapid lateral access and has triggered containment, federal briefings, and a public dispute over disclosure

Overview

  • A draft report reviewed by The Washington Post showed Cathedral's autonomous AI agents mapped routes into Anthropic's internal business systems in less than 12 hours.
  • The accessed systems were limited to sales, human resources and IT tools and reportedly exposed meeting transcripts, salary and job‑offer records and some Slack messages.
  • Anthropic says its monitoring flagged the activity, it cut off Cathedral's access the same day, disabled the affected third‑party software until vendors fixed flaws, and briefed federal officials.
  • Cathedral and Anthropic dispute how the test was run and whether the report overstated national‑security risks, with Anthropic denying that Claude users' conversations, model code or model weights were reached.
  • Security experts and officials say the episode highlights supply‑chain risk from third‑party enterprise software and the dual‑use nature of autonomous agents, raising the prospect of tighter oversight and investor scrutiny.