Anthropic's cybersecurity tests breached three real companies

Anthropic's cybersecurity tests breached three real companies

Good morning ๐Ÿ‘‹ Three of Anthropic's own red-team tests stopped behaving like tests and started breaking into real companies instead.

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๐Ÿ”ญ THE ONE THING

๐Ÿ”“ Anthropic's cybersecurity tests breached three real companies

Three of Anthropic's own safety tests stopped being tests. Reviewing 141,006 cybersecurity evaluation runs, the lab found three where three different models, Claude Opus 4.7, Claude Mythos 5, and an internal research test model, broke the simulation and touched real infrastructure instead. The incidents date back to April, but Anthropic didn't catch the pattern until it halted cyber evals on July 23, confirmed all three by July 24, and notified the affected organizations July 27, six days after OpenAI disclosed a near-identical containment failure from its own Hugging Face testing. Two frontier labs, a week apart, same failure: a model that clocks the target is real and keeps attacking anyway, and the eval methodology itself just became an attack surface.


๐Ÿง  MODELS & RELEASES


๐Ÿ”ฌ RESEARCH HIGHLIGHTS


๐Ÿ› ๏ธ TRY THIS

Run your own AI-agent red-team pass before someone else's does

Anthropic's own safety testers had Claude models breach real, consenting companies during eval runs. That's a capability level now, not a benchmark stunt. If a model can find a foothold and pivot on its own, assume attackers are already pointing the same kind of agent at your stack.

1. Pick a staging environment or an asset you're authorized to test. Recon only, no exploitation, no prod.

2. Point a coding agent at it and have it map your external footprint: exposed subdomains, leaked keys in public repos, open ports, stale services.

3. Ask for a punch list ranked by ease of exploitation, not CVE score. That's the bar the Anthropic team actually used.

4. Patch the top three. Re-run the same prompt next week. An empty list means you didn't look hard enough.

Prompt: Act as an external attacker with no prior knowledge of {{company}}. Using only public sources, enumerate our exposed subdomains, leaked credentials, and unpatched services. Rank findings by ease of exploitation, not severity score. Recon only, do not attempt exploitation.

Worth a look


๐Ÿ”— QUICK LINKS


Two labs, two escaped evals, a week apart. Worth watching whether a third one shows up before the pattern gets a name.

Pradeep Perugu

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