How to Prevent IDOR Vulnerabilities in Next.js API Routes

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How to Prevent IDOR Vulnerabilities in Next.js API Routes
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Imagine this situation: A user logs in successfully to your application, but upon loading their dashboard, they see someone else’s data. The authentication worked, the session is valid, the user is authenticated, but the authorization failed. This specific issue is called IDOR (Insecure Direct Object Reference). It’s one of the most common security bugs and is categorized under Broken Object Level Authorization (BOLA) in the OWASP API Security Top 10. In this tutorial, you’ll learn: Why IDOR happens Why authentication alone is not enough How object-level authorization works How to fix IDOR properly in Next.js API routes How to design safer APIs from the start Table of Content Table of Content Authentication vs...

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