nextjs-auth-bypass
Analysis and exploitation of a Next.js authorization bypass vulnerability (CVE-2025-29927)
Next.js Authorization Bypass – CVE Analysis
Overview
This project demonstrates an authorization bypass vulnerability in a Next.js application caused by improper middleware validation.
Vulnerability Details
- Type: Authorization Bypass
- CVE: CVE-2025-29927
- Severity: Critical (CVSS 9.1)
- Burp Suite
- Kali Linux
- Firefox
Exploitation Summary
- Intercepted HTTP request using Burp Suite
- Modified request header to bypass authentication
- Gained unauthorized access to admin dashboard
Root Cause
Improper validation of middleware allowed internal request bypass using custom headers.
Impact
- Unauthorized admin access
- Potential data exposure
- Privilege escalation
Mitigation
- Validate all requests server-side
- Do not trust client-controlled headers
- Implement strict authentication checks
Skills Demonstrated
- Web Application Security
- Burp Suite
- Vulnerability Analysis
- OWASP Top 10
Project File
Refer to the attached PDF for full details.
shahin-shadow/nextjs-auth-bypass
