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Claude Desktop extension dialog on macOS with a security prompt, highlighting sanitized AppleScript parameters and blocked shell operators

Claude Desktop Extensions Vulnerable to Command Injection

Researchers documented CVSS 8.9 command injection in three official Claude Desktop extensions Chrome, iMessage, and Apple Notes. Because those connectors built AppleScript commands with unescaped user input, prompt injection could pivot from web content to local shell execution on macOS. Anthropic patched the issues. This analysis explains the exploit chain, the fixes, and the validation steps security teams should run to keep MCP servers safe.

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