ShadowPrompt
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Researchers find flaw that could let websites inject prompts into Anthropic’s Claude Chrome extension
Researchers disclosed a flaw called ShadowPrompt in Anthropic’s Claude Chrome extension that combined an overly permissive origin allowlist and a DOM-based XSS in an Arkose Labs CAPTCHA, allowing websites to inject prompts; Anthropic and Arkose issued fixes in December 2025 and February 2026.
