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

Source

https://github.com/lediusa/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.

Description

New nuclei CVE

Readme

# CVE-2025-29927 - Next.js Middleware Authentication Bypass (Advanced Bypass)

## 🔥 Overview
An **advanced PoC** for **CVE-2025-29927**, allowing authentication bypass in **Next.js Middleware** by manipulating specific headers.  
This template enhances **WAF evasion** and **security bypass** techniques.

## 🚀 Features
✅ **Multi-Request & HTTP Method Variation** → Uses `GET`, `POST` to maximize detection.  
✅ **WAF Evasion** → Includes `X-Forwarded-For`, `X-Original-URL`, `X-Rewrite-URL`, and more.  
✅ **Randomized Query Parameters** → Prevents caching issues and improves bypass reliability.  
✅ **Multiple Response Matching** → Detects `200 OK`, `Next.js` headers, and sensitive content.  

## 🛠️ Usage
1️⃣ **Install** → `go install -v github.com/projectdiscovery/nuclei/v2/cmd/nuclei@latest`  
2️⃣ **Template** → `git clone https://github.com/lediusa/CVE-2025-29927.git`  
3️⃣ **Run Scan** → `nuclei -t CVE-2025-29927.yaml -u http://target.com`  

📌 **Note:** This template is for **security research & authorized testing only.**

File Snapshot

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