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...

CVE-2026-46339

Summary: CVE-2026-46339 affects 9Router, where middleware did not protect /api/cli-tools/* and /api/mcp/* until a fix in 0.4.37. Connected sources describe unauthenticated registration of custom MCP plugins via /api/cli-tools/cowork-settings and command execution through the MCP bridge, enabling ...