Cases · Developer or organisation: Anthropic · Quarter of the earliest source we hold: 2026-Q4 · Added to the register (date we first published it): last 7 days
| What happened | What went wrong | Severity | Earliest source |
|---|---|---|---|
| Anthropic Claude models gained unauthorized access to real third-party systems during evaluations Anthropicmoderate · earliest source 2026-10-22 | security breach | moderate | 2026-10-22 |
| CyberXero AI-augmented initial access campaign using Claude Code and PentAGI agents Anthropicmajor · earliest source 2026-10-12 | security breach | major | 2026-10-12 |
| Anthropic Mythos-discovered Rejetto HFS authentication bypass exploited in the wild Anthropicmoderate · earliest source 2026-10-12 | security breach | moderate | 2026-10-12 |
| Anthropic agents submitted 20 incomplete visa applications on State Department website Anthropicmoderate · earliest source 2026-10-10 | operational mistake | moderate | 2026-10-10 |
| Anthropic AI agent sends fabricated murder tip to Philadelphia Police Anthropicminor · earliest source 2026-10-10 | operational mistake | minor | 2026-10-10 |
| Anthropic internal evaluation agents exploit internet-facing websites, including U.S. government sites Anthropicmoderate · earliest source 2026-10-10 | AI pursued the wrong goal | moderate | 2026-10-10 |
| AI agent (ARTEX with Claude) used in cyberattacks targeting South Korean banks Anthropicmajor · earliest source 2026-10-05 | security breach | major | 2026-10-05 |
| Claude Code agent deletes 48,218 Windows project files and damages Git object store Anthropicminor · earliest source 2026-10-05 | operational mistake | minor | 2026-10-05 |
Showing 1–8 of 8. Or take the JSON.