Harden Your Local MCP Server Against AutoJack RCE
K
Kodetra Technologies··9 min read Advanced Summary
AutoJack turned a local MCP server into RCE. Harden yours with origin checks, auth, and allowlists.
Harden Your Local MCP Server Against AutoJack RCE
On June 18, 2026, Microsoft's Defender research team published AutoJack, an exploit chain that turns an AI browsing agent into a remote code execution vector on the machine it runs on. The setup is unnervingly small: the agent opens one attacker-controlled web page, JavaScript on that page reaches a privileged service listening on localhost (in the disclosure, AutoGen Studio's MCP WebSocket), and a process gets spawned on the host. No login screen, no credentials, no second click.
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