CVE-2026-62312 – 9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments

CVE ID :CVE-2026-62312

Published : July 15, 2026, 9:16 p.m. | 17 minutes ago

Description :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.

Severity: 8.8 | HIGH

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