Preventing IDOR Vulnerabilities in Next.js API Routes
next.js•Feb 27, 2026

Preventing IDOR Vulnerabilities in Next.js API Routes

IDOR vulnerabilities occur when authentication works but authorization fails, allowing unauthorized access to sensitive data. This tutorial explains how to prevent IDOR vulnerabilities in Next.js API routes by implementing object-level authorization and designing safer APIs.

freecodecamp

freecodecamp

Original source

Key summary

Learn how to prevent IDOR vulnerabilities in Next.js API routes by understanding the difference between authentication and authorization, and implementing object-level authorization to ensure secure API design.

TL;DR

  • IDOR vulnerabilities occur when authentication works but authorization fails.
  • Authentication answers 'Who are you?' while authorization answers 'What are you allowed to access?'
  • Object-level authorization ensures that users can only access resources they are authorized to access.
  • IDOR vulnerabilities can be prevented by implementing object-level authorization in Next.js API routes.
  • Designing safer APIs from the start is crucial to prevent IDOR vulnerabilities.
  • Use the 'Mental Model for API Design' to ensure secure API design.

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