CVE-2025-29927 PoC — Authorization Bypass in Next.js Middleware

Source

https://github.com/JOOJIII/CVE-2025-29927

Associated Vulnerability

Title:Authorization Bypass in Next.js Middleware (CVE-2025-29927)
Description:Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.

Readme

CVE-2025-29927 in Next.js 15.2.0

How to Run: 

```bash
git clone https://github.com/nyctophile0969/CVE-2025-29927
cd CVE-2025-29927
npm install next@15.2.0
npm run dev
```

File Snapshot


 [4.0K]  /data/pocs/442340e2f60e9330b82a3c040a91e79a5b5eb46b
├── [4.0K]  app
│   ├── [4.0K]  dashboard
│   │   ├── [  87]  layout.js
│   │   └── [1.2K]  page.js
│   ├── [ 25K]  favicon.ico
│   ├── [ 399]  globals.css
│   ├── [ 481]  layout.js
│   ├── [4.0K]  login
│   │   └── [2.2K]  page.js
│   └── [2.9K]  page.js
├── [4.0K]  components
│   ├── [1.1K]  AuthProvider.js
│   └── [ 463]  PrivateRoute.js
├── [ 369]  eslint.config.mjs
├── [  73]  jsconfig.json
├── [4.0K]  lib
│   └── [ 787]  auth.js
├── [ 800]  middleware.js
├── [  92]  next.config.mjs
├── [ 455]  package.json
├── [193K]  package-lock.json
├── [  81]  postcss.config.mjs
├── [4.0K]  public
│   ├── [ 391]  file.svg
│   ├── [1.0K]  globe.svg
│   ├── [1.3K]  next.svg
│   ├── [ 128]  vercel.svg
│   └── [ 385]  window.svg
└── [ 173]  README.md

6 directories, 23 files

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