Advanced IDOR Exploitation in 2025: A Practical Guide for Bug Bounty Hunters

“You won’t find IDOR in URLs anymore. You’ll find it deep in logic, async events, and token misuse.”

Insecure Direct Object Reference (IDOR) vulnerabilities are not gone — they’ve just evolved. The basic idea is the same: modifying an identifier to access something you shouldn’t. But now, in 2025, the low-hanging fruit is gone.

Today’s IDORs are:

Buried in mobile APIs and async flows

Tied to tokens, roles, or microservices

Harder to find, but often still unprotected

This guide is for serious bug bounty hunters and security researchers who want to find real bounties, not outdated ?id=2 examples.

🔍 Table of Contents

• What is IDOR (in 2025)?
• Where IDOR Still Lives
• Advanced Exploitation Techniques
• JWT Binding Bypass
• Cross-Endpoint Object Reuse
• Async Action IDOR
• Frontend-Backend Desync
• Cloud Job/Bucket Abuse
• GraphQL Access Control Gaps
• Parameter Pollution Tricks