Forensic Summary
A vulnerability dubbed ClaudeBleed in Anthropic's Claude Chrome extension allows any browser extension to inject arbitrary prompts into the Claude AI agent by exploiting lax permission checks and improper trust validation. Attackers can bypass user confirmation protections via DOM manipulation and repeated message forging, enabling full agent takeover for information theft or unauthorized actions. The flaw effectively breaks Chrome's extension security model and exposes users running Claude's agentic capabilities to third-party extension compromise.
Read the full technical deep-dive on Grid the Grey: https://gridthegrey.com/posts/claudebleed-flaw-lets-rogue-chrome-extensions-hijack-ai-agent/
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