IDOR BugBounty Labs: 5 Realistic Challenges to Master Insecure Direct Object Reference
An intentionally vulnerable e-commerce platform that teaches you to find, exploit, and understand IDOR vulnerabilities — the way they actually appear in the wild. Let's talk about the most deceptively simple vulnerability in web security: IDOR . On paper, it sounds trivial — change a number in the URL, access someone else's data, collect your bounty. But anyone who's spent real time hunting knows the truth: IDORs in production applications are rarely that obvious. They hide in request bodies, lurk inside multi-step workflows, and disguise themselves behind modern frontend frameworks that abstract away the very IDs you're supposed to manipulate. That gap — between textbook IDOR and real-world IDOR — is exactly where IDOR BugBounty Labs lives. What Is IDOR BugBounty Labs? It's an open-source, Node.js/Express e-commerce application built with one purpose: to give you a realistic playground for practicing IDOR attacks. Not simulated. Not theoretical. Intentionally vulnerable, locally hosted, and designed to mirror the complexity of actual Bug Bounty targets. Built with Express and TailwindCSS, it simulates a functioning online store — complete with user accounts, orders, addresses, support tickets, notification settings, and a checkout flow. Every feature contains at least one authorization flaw waiting to be exploited. Why This Lab Is Different Most IDOR labs give you one obvious URL parameter to change and call it a day. This one doesn't. IDOR BugBounty Labs includes: 5 distinct challenges ranging from easy to hard 3 different IDOR types: URL parameters, request bodies, and hidden body parameters Both read and write IDORs — accessing data and modifying it Multi-step business logic that mimics real e-commerce flows A flag submission system so you can verify your findings The challenges don't just teach you to change an ID. They teach you to think about where IDs live, how they're passed, and what happens when authorization checks are missing. The 5 Challenges 1. Read O