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CVE-2026-55638— 9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass

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 0.5.2之前版本存在授权问题漏洞，该漏洞源于对 /codex 路径的访问控制不当，可能导致远程未经身份验证的攻击者绕过API密钥保护，利用操作员存储的LLM提供商凭证进行上游提供者调用。

CVSS 8.6 · High EPSS 0.61% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
decolua 9router < 0.5.2 affected
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I. Basic Information for CVE-2026-55638

Vulnerability Information
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Vulnerability Title
9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass
Source: CVE Program / CVE List V5
Vulnerability Description
9Router is an AI router & token saver. Prior to 0.5.2, 9router protects /v1, /v1beta, /api/v1, and /api/v1beta in src/dashboardGuard.js but omits /codex before next.config.mjs rewrites /codex/* to /api/v1/responses. A remote unauthenticated attacker can send requests to /codex/* to bypass the API-key gate and cause the server to make upstream provider calls using operator-stored LLM provider credentials. This issue is fixed in version 0.5.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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 0.5.2之前版本存在授权问题漏洞，该漏洞源于对 /codex 路径的访问控制不当，可能导致远程未经身份验证的攻击者绕过API密钥保护，利用操作员存储的LLM提供商凭证进行上游提供者调用。
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 < 0.5.2 -

II. Public POCs for CVE-2026-55638

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: /codex request did not return upstream proof token
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
Qwen3.6-35B-A3B · 8280 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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POC zip download
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III. Intelligence Information for CVE-2026-55638

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Patches & Fixes for CVE-2026-55638 (1)

Vendor Advisories for CVE-2026-55638 (1)

Other References for CVE-2026-55638 (1)

Same Patch Batch · decolua · 2026-07-10 · 6 CVEs total

CVE-2026-55500 9.9 CRITICAL 9router: Exposure of Sensitive Information and Unprotected Database Import/Export Allows C
CVE-2026-56675 8.3 HIGH 9router: Reverse proxy locality collapse allows unauthenticated access to 9router /v1 APIs
CVE-2026-55641 8.2 HIGH 9router: Unauthenticated `/v1` proxy access via `Host`-header spoofing → open AI relay + S
CVE-2026-56676 7.4 HIGH 9router: Image prefetch DNS rebinding allows SSRF to internal services
CVE-2026-55501 7.3 HIGH 9router: Login brute-force protection bypass via spoofed X-Forwarded-For header

IV. Related Vulnerabilities

Same product: 9router
Same vendor: decolua
Same weakness: CWE-862

V. Comments for CVE-2026-55638

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