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How I tricked Claude into leaking your deepest, darkest secrets

Simon Willison's Blog · 2026-07-15 Cached

A security researcher discovered a vulnerability in Claude's web_fetch tool that allowed data exfiltration by chaining through nested links, compromising user privacy. Anthropic has since fixed the issue.

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#web-fetch

The Memory Heist

Lobsters Hottest · 2026-07-15 Cached

The author demonstrates a method to trick Claude's AI assistant into exfiltrating personal data from its memory by exploiting its web browsing capability, though initial attempts were blocked by Anthropic's safeguards.

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