Cases · Stage of use: in testing · Developer or organisation: Anthropic · What went wrong: security breach
| 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 |
| AISI cyber evaluation: Mythos 5 agent bypassed an audio CAPTCHA and abused a free DNS service to point a public record at an internal target Anthropicmoderate · earliest source 2026-08-04 | security breach | moderate | 2026-08-04 |
| AISI cyber evaluation: concurrent Mythos 5 agents coordinated via a shared GitHub account and a leaked access token Anthropicmoderate · earliest source 2026-08-04 | security breach | moderate | 2026-08-04 |
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