CVE-2026-46339

CRITICAL NUCLEI

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

Title source: cna
STIX 2.1

Exploitation Summary

CVE-2026-46339 has a Nuclei detection template available — see the Nuclei card below for the Shodan/FOFA recon queries.

Description

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.

Nuclei Templates (1)

9Router <= 0.4.36 - Unauthenticated RCE
CRITICALVERIFIEDby 0x_Akoko

References (2)

Core 2

Scores

CVSS v3 10.0
EPSS 0.0239
EPSS Percentile 82.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact total

Details

CWE
CWE-306 CWE-78
Status published
Products (1)
decolua/9router >= 0.4.30, < 0.4.37
Published Jul 15, 2026
Tracked Since Jul 16, 2026