Description
9Router is an AI router & token saver. In 0.4.45 and earlier, 9Router's src/dashboardGuard.js local-only access gate used Host and Origin headers in isLocalRequest() to protect /api/mcp/*, /api/tunnel/*, and /api/cli-tools/*, allowing header spoofing in reverse proxy or tunnel deployments to reach MCP child process stdin paths.
References5
- github.com/decolua/9router/commit/5e1c1261368e06dced1cbc6506845…
- github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919…
- github.com/decolua/9router/releases/tag/v0.4.46
- github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-7…
- github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-7…
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N - EPSS — exploit probability
- 0% percentile: 33 · as of 15 November 2026
- CWE
- CWE-290
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.