Cathedral claims it breached Anthropic in under 12 hours via third-party software

AI startup Cathedral used autonomous agents to break into Anthropic's systems in less than 12 hours by exploiting flaws in third-party enterprise software. The agents reached meeting transcripts, salary data and Slack messages, plus contact details of some customers and partners; source code and model weights were not accessed.

• Cathedral's agents found a way into Anthropic in under 12 hours
• HR, sales and IT systems hit: transcripts, salaries, Slack messages
• Anthropic says its monitoring flagged activity before the report and cut access same day
• Source code and AI model weights were not compromised