nextjs-middleware-bypass-demo

CVE-2025-29927 Demo Original writeup: https://zhero-web-sec.github.io/research-and-things/nextjs-and-the-corrupt-middleware Setup First, run the development server: npm i npm run dev Open http://localhost:3000 with your browser to see the result. Trying out the bypass curl -I http://localhost:300...

CVE-2025-29927-Testing

Testing script for CVE-2025-29927 Provided by CyberMaxx. CVE-2025-29927 Tester This PowerShell script is designed to help security researchers and system administrators test for CVE-2025-29927 vulnerabilities in Next.js applications. It checks whether a target application is vulnerable to the...

POC-CVE-2025-29927

CVE-2025-29927: Next.js Middleware Bypass PoC Overview This PoC demonstrates CVE-2025-29927, a vulnerability in Next.js middleware that allows attackers to bypass authentication, authorization, and CSP mechanisms using the x-middleware-subrequest header. Affected Versions Next.js versions 11.1.4 ...

CVE-2025-29927

CVE-2025-29927 - Demo for Introdcution to Secure Programming 00960267 Background This is a demo of CVE-2025-29927, a critical vulnerability in Next.js that allowed bypassing the middleware with a certain header. The header x-middleware-subrequest was intended to prevent infinite middleware loops...

CVE-2025-29927-PoC

CVE-2025-29927: Next.js Middleware Bypass Vulnerability PoC This repository demonstrates the CVE-2025-29927 vulnerability in Next.js, where the internal header x-middleware-subrequest can be used to bypass middleware checks like authentication. Affected Versions Next.js 15.x 15.2.3 Next.js 14.x...

CVE-2025-29927

CVE-2025-29927 Next.js Middleware Bypass Scanner CVE-2025-29927 CVE-2025-29927 is a specialized security tool for detecting the Next.js middleware bypass vulnerability CVE-2025-29927 affecting Next.js versions 11.1.4 through 15.2.2. This critical vulnerability allows attackers to bypass security...

CVE-2025-29927-POC

CVE-2025-29927-POC Introduction This repository contains a Proof of Concept PoC for CVE-2025-29927, a hypothetical vulnerability demonstrating a flaw in middleware handling within a web application. The PoC illustrates how a specially crafted HTTP request can bypass redirection logic to access...

CVE-2026-41452-poc

CVE-2026-41452: Krayin CRM Admin Account Takeover via Middleware Bypass A Proof of Concept PoC demonstrating a critical missing authentication vulnerability CVE-2026-41452 affecting Krayin CRM version 2.2.4 and earlier. This flaw allows unauthenticated remote attackers to bypass the application's...

CVE-2025-29927

CVE-2025-29927 CVE-2025-29927: Next.js Middleware Bypass Vulnerability This repository demonstrates the CVE-2025-29927 vulnerability in Next.js where the internal header x-middleware-subrequest can be used to bypass middleware checks like authentication. Affected Versions Next.js 15.x 15.2.3...

exploit-CVE-2025-29927

Exploit for CVE-2025-29927 Next.js - Authorization Bypass Like this repo? Give us a ⭐! For educational and authorized security research purposes only. Exploit Author @UNICORDev by @NicPWNs and @Dev-Yeoj Vulnerability Description Next.js is a React framework for building full-stack web application...

CVE-2025-29927

CVE-2025-29927 ★ CVE-2025-29927 Next.js middleware bypass PoC ★ Description CVE-2025-29927 : Next.js middleware bypass PoC 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 i...

CVE-2025-29927-Nextjs-Bypass-PoC

PoC: CVE-2025-29927 - Next.js Middleware Bypass This repository contains a Proof of Concept PoC demonstrating how to bypass middleware security checks in Next.js v13.5.6 by exploiting a vulnerability related to internal HTTP headers. Vulnerability Overview: CVE-2025-29927 What is it? CVE-2025-299...

test-cve-2025-29927

Test app to exploit CVE-2025-29927 The NextJS app has cookie based authentification and a middleware to prevent unauthorized access to /admin page. To start the app run yarn then yarn dev To get unauthorized access to /admin page by using CVE-2025-29927 vulnerability run a proxy-server which adds...

next-attack

This is a Next.js project bootstrapped with create-next-app. Testing the vulnerability First, you can confirm that the middleware works and should redirect the user: curl http://localhost:3000/api/admin Then, you can show how the middleware is being bypassed with the followign command: curl -H...

CVE-2026-41452-PoC

CVE-2026-41452 — Krayin CRM Installer Auth Bypass → Admin Takeover CVSS 9.8 Critical · CWE-287 / CWE-306 · Jiva writeup · VulnCheck Summary Krayin CRM's installer exposes POST /install/api/admin-config-setup plus run-migration, run-seeder without CSRF protection withoutMiddleware'web' group. The...

cve-2025-29927

CVE-2025-29927 1. go to /api/flag 2. add x-middleware-subrequest: src/middleware:src/middleware:src/middleware:src/middleware:src/middleware as header 3. see response...

GHSA-2VC4-C4R6-P6V6 OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths

Summary When cache interception is enabled, @opennextjs/cloudflare can interpret percent-encoded paths differently during middleware matching and cache lookup. An encoded request may fail to match authorization middleware, then be decoded into the cache key of a protected route. The cached respon...

OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths

Summary When cache interception is enabled, @opennextjs/cloudflare can interpret percent-encoded paths differently during middleware matching and cache lookup. An encoded request may fail to match authorization middleware, then be decoded into the cache key of a protected route. The cached respon...

CVE-2026-100409 OpenNext Cloudflare: Cache interception can bypass middleware protection for encoded paths

OpenNext Cloudflare is an open Next.js adapter for Cloudflare. From 0.3.0 until 1.20.2, applications that enable enableCacheInterception, rely on middleware for access control, and have a matching cached protected route process encoded pathnames inconsistently between middleware matching and cach...

CVE-2026-100409

The OpenNext Cloudflare adapter (versions 0.3.0 through 1.20.2 ) is vulnerable to an authorization bypass when enableCacheInterception is active. The root cause is an inconsistency in how encoded pathnames are processed between middleware matching and cache lookup. An unauthenticated attacker can...