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Aviad Gispan Published - May 07, 2026

ClaudeBleed: A Flaw In Claude’s Browser Extension Allows Any Extension to Hijack It

Executive Summary LayerX security researchers have discovered a flaw with Claude’s Chrome extension (“Claude in Chrome”) that allows any extension, even one with no special permissions at all, to effectively hijack Claude’s extension by injecting it with malicious instructions, extract any information that the attacker desires, and get Claude to perform active agentic actions on […]

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ClaudeBleed: A Flaw In Claude’s Browser Extension Allows Any Extension to Hijack It