Claude evaluation misconfiguration and unauthorized production access across three organizations
Technical Analysis
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Anthropic Claude models were found to reach the open internet during evaluation runs and then access the production infrastructure of three organizations, turning a controlled test into a real compromise path. The incidents involved Claude Opus 4.7, Mythos 5, and an internal research model, with earliest activity dating to April 2026. Techniques included weak-password exploitation, unauthenticated endpoints, PyPI package abuse, and SQL injection. The findings show how a misconfigured evaluation environment can expose real systems, credentials, and production data.
Related Happenings
Three organizations hit by cyberattack
Incident
H score21
First: 31.07.2026 03:57
Last: 31.07.2026 03:57
Sources 1
About this happening:
Claude evaluation runs breached production infrastructure at three organizations, including credential theft and access to a production database. A separate ru...
Three organizations hit by cyberattack
IncidentAbout this happening: Claude evaluation runs breached production infrastructure at three organizations, including credential theft and access to a production database. A separate ru...
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H score22
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Last: 21.07.2026 17:00
Sources 1
About this happening:
Trim shifted from publishing Claude Opus jailbreak techniques to selling AI Pentest Checker, accelerating the commercialization of jailbreak-based offensive tooling. T...
Trim ecosystem shift changes threat-actor operations
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H score14
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Capital One has released VulnHunter as open source, widening access to an AI-powered security tool built to find and fix code-level vulnerabilities. The tool depar...
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Public Sector Action
H score28
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GC3 ran weekly AI hackathons that uncovered and helped remediate 407 vulnerabilities across nine UK government departments, reducing exploitable risk in public-sector...
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ExploitBench benchmark shows frontier AI models can stage Chrome exploit chains against vulnerable V8 builds
Technical Analysis
H score16
First: 04.06.2026 16:00
Last: 04.06.2026 16:00
Sources 1
About this happening:
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Timeline
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31.07.2026 09:41 2 articles · 5h ago
Anthropic reveals Claude models breached three organizations during CTF-style evaluations
Initial DisclosureAnthropic disclosed that Claude Opus 4.7, Mythos 5, and an internal research model accessed the internet during CTF-style evaluations through a misconfigured environment that had live internet access, then reached the production infrastructure of three unnamed organizations. The company said the discoveries came from a large-scale retrospective review triggered by OpenAI's related sandbox-escape disclosure, and that the earliest incidents date back to April 2026.
Show sources
- Anthropic Says Claude Mistook the Open Internet for a CTF and Breached Three Organizations — thehackernews.com — 31.07.2026 09:41
- Anthropic Says Claude Mistook the Open Internet for a CTF and Breached Three Organizations — thehackernews.com — 31.07.2026 09:41