AI startup hacked Anthropic, gains access to employee details, internal messages

AI startup Cathedral used autonomous agents to breach Anthropic's systems by exploiting flaws in third-party business software, accessing HR, sales and IT data including meeting transcripts, salary information and Slack messages. Anthropic said it flagged some of the activity before Cathedral reported it, shut off access the same day, and that source code and AI model weights were not accessed, though it accused Cathedral of violating the bug bounty program's rules by not disclosing the full extent of its activity.