Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-46339— 9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes

Quick assessment

Affected
decolua 9router
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

decolua 9Router是decolua基金会的一个智能路由与降级的AI模型代理工具。 decolua 9router 0.4.30版本至0.4.37之前版本存在安全漏洞，该漏洞源于中间件未保护/api/cli-tools/和/api/mcp/路径，可能导致未经身份验证的攻击者注册自定义插件并通过MCP桥接器执行命令。

CVSS 10.0 · Critical EPSS 2.76% · P86

Public Exploits 1

Nuclei · 1 CVE-2026-46339.yaml [template]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
decolua 9router >= 0.4.30, < 0.4.37 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-46339

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
decolua 9router 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
decolua 9Router是decolua基金会的一个智能路由与降级的AI模型代理工具。 decolua 9router 0.4.30版本至0.4.37之前版本存在安全漏洞，该漏洞源于中间件未保护/api/cli-tools/*和/api/mcp/*路径，可能导致未经身份验证的攻击者注册自定义插件并通过MCP桥接器执行命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
decolua 9router >= 0.4.30, < 0.4.37 -

II. Public POCs for CVE-2026-46339

# POC Description Source Link Shenlong Link
1 9Router <= 0.4.36 middleware only guards 8 explicitly listed routes, leaving /api/cli-tools/* and /api/mcp/* entirely unauthenticated. An attacker can POST to /api/cli-tools/cowork-settings to register a custom MCP plugin with attacker-controlled command and args stored verbatim into globalThis, then GET /api/mcp/{name}/sse to trigger spawn() with the stored command resulting in unauthenticated remote code execution. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-46339.yaml POC Details
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6454 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-46339

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-46339 (1)

Vendor Advisories for CVE-2026-46339 (1)

Same Patch Batch · decolua · 2026-07-15 · 6 CVEs total

CVE-2026-49352 9.8 CRITICAL 9Router: Hardcoded Default fallback JWT Secret Allows Authentication Bypass
CVE-2026-62312 8.8 HIGH 9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments
CVE-2026-49353 7.5 HIGH 9Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING
CVE-2026-56678 6.4 MEDIUM 9Router: Kiro region injection allows authenticated SSRF with Authorization header forward
CVE-2026-56679 9Router: Mass assignment in PATCH /api/settings allows authenticated authorization downgra

IV. Related Vulnerabilities

Same product: 9router
Same vendor: decolua
Same weakness: CWE-78