CVE-2026-46339 9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes

9Router is an AI router & token saver. From 0.4.30 until 0.4.37, 9Router's src/proxy.js middleware did not protect /api/cli-tools/ and /api/mcp/, allowing unauthenticated registration of customPlugins through src/app/api/cli-tools/cowork-settings/route.js and command execution through the MCP...

PT-2026-42036

Name of the Vulnerable Software and Affected Versions 9router versions 0.4.30 through 0.4.36 Description 9router contains a flaw where the Next.js middleware fails to protect several API endpoints, allowing unauthenticated network-adjacent attackers to execute arbitrary OS commands as the user...