Cases · Developer or organisation: Anthropic · What went wrong: security breach · Quarter of the earliest source we hold: 2026-Q4
| 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 |
| AI agent (ARTEX with Claude) used in cyberattacks targeting South Korean banks Anthropicmajor · earliest source 2026-10-05 | security breach | major | 2026-10-05 |
Showing 1–4 of 4. Or take the JSON.