data-breach

Anthropic confirmed unauthorized users accessed its Mythos vulnerability detection model through a third-party vendor environment by guessing URL patterns. Early analysis from Mozilla and AWS indicates Mythos performs on par with elite human security researchers rather than surpassing them, despite Anthropic's claims of identifying thousands of critical vulnerabilities.

Anthropic's Claude Mythos Preview, a cybersecurity AI model restricted to select companies including Nvidia, Google, and Microsoft, was accessed by unauthorized users starting April 7, 2025. The group obtained access through a third-party contractor and internet sleuthing techniques, according to Bloomberg.