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Tool Directory

CVE-2026-46339

CriticalPublished

9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes

Published: Jul 15, 2026
Updated: Jul 16, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 28, 2026

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS probability estimate

3.4%

Low · next 30 days

Percentile: 88.2%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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 bridge. This vulnerability is fixed in 0.4.37.

Sources

CTT-Enhanced-CVE-2026-46339-Exploit-EngineExploit
Python framework exploiting CVE-2026-46339 for unauthenticated RCE on 9Router via MCP bridge, using temporal sharding and dispersion to evade detection.

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