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A small group accessed Claude Mythos Preview by guessing the model’s URL on the same day Anthropic announced Project Glasswing.
Unauthorized users accessed Anthropic's restricted Claude Mythos Preview by guessing its URL format.
KEY POINTS
- A third-party contractor working with Anthropic is implicated in facilitating the unauthorized group's access.
- Mythos Preview autonomously found thousands of zero-day vulnerabilities and composed advanced working exploits.
- The breach exploited weaker controls at a vendor environment, not Anthropic’s core systems directly.
- This incident undermines Anthropic’s claims of rigorous access controls during ongoing legal disputes with the government.
COMPANIES
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