Vulnerability in Claude Extension for Chrome Exposes AI Agent to Takeover

A vulnerability in the Claude extension for Chrome could allow attackers to take over the AI agent and abuse it for information theft, cybersecurity firm LayerX reports.

The flaw, dubbed ClaudeBleed, is a combination of lax permissions, where any Chrome extension can run commands in Claude in Chrome, and poorly implemented trust in the origin of the command, not the execution context.

According to LayerX, the main issue is that the Claude extension allows interaction with any script running in the origin browser, without verifying its owner.

“As a result, any extension can invoke a content script (which does not require any special permissions) and issue commands to the Claude extension,” the company explains.

Claude in Chrome, it says, trusts the origin of the execution, which is claude.ai, and not the execution context, thus allowing any JavaScript running in the origin to issue privileged commands.

This allows an attacker...

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