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AutoJack: Microsoft AutoGen Studio RCE via MCP WebSocket

AutoJack: Microsoft AutoGen Studio RCE via MCP WebSocket

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 8.5 BleepingComputer

A three-flaw vulnerability chain dubbed AutoJack in Microsoft's AutoGen Studio allowed attackers to execute arbitrary commands on a developer's host system by manipulating a browsing AI agent into connecting to a malicious webpage. The attack exploited missing authentication on MCP WebSocket routes combined with unsanitised base64-encoded parameters to launch arbitrary processes. Microsoft confirmed the flaw was patched before any PyPI release, limiting exposure to developers building directly from the main GitHub branch.

AutoGen Studio RCE: AutoJack Exploit Chain Targets Developers

AutoGen Studio RCE: AutoJack Exploit Chain Targets Developers

ATLAS OWASP HIGH Significant risk · Prioritise patching ▲ 9.1 The Hacker News

Microsoft researchers disclosed AutoJack, an exploit chain targeting AutoGen Studio's MCP WebSocket endpoint that allows a single malicious web page to execute arbitrary commands on a developer's host machine via an AI browsing agent. The attack chains three distinct weaknesses — localhost trust bypass, missing authentication on MCP paths, and unsanitised command execution — requiring no credentials or user interaction beyond the agent loading the attacker's URL. While the vulnerable handler was not included in stable PyPI releases, it shipped in two pre-release builds that remain unyanked, leaving anyone who installed those versions exposed.

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