CVE-2026-62312 — 9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments
9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combini…
Published: 2026-07-15 · CVSS: 8.8 · CVSS 3.1
9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7