Comprehensive IDOR Guide
Comprehensive IDOR Guide 🆕 Enhanced May 2, 2026 - Updated with 185 sources (+741% expansion) including modern IDOR enumeration patterns, authorization bypass techniques, and 2026 critical CVEs. A practitioner’s reference for Insecure Direct Object Reference (IDOR) and Broken Object Level Authorization (BOLA) — attack surface, enumeration patterns, bypass techniques, real-world writeups, detection workflow, and prevention. Compiled from 22 research sources. Table of Contents Fundamentals IDOR vs BOLA vs BFLA Attack Surface & Where Identifiers Live Horizontal vs Vertical Access Identifier Enumeration Patterns Parameter Tampering Techniques HTTP Method & Verb Tampering Content-Type & Format Bypasses Path, Version, and Endpoint Tricks Mass Assignment Overlap UUID & Unpredictable ID Defeats Second-Order and Blind IDOR GraphQL, WebSocket, and Non-REST Surfaces Real-World Writeups & CVEs Exploit Chains Detection Methodology with Autorize Tools & Automation Impact & Severity Mapping Prevention & Secure Design Testing Checklist Report Writing 1. Fundamentals IDOR occurs when an application uses user-supplied input to reference an internal object (database row, file, resource) and fails to verify whether the current user is authorized to access that specific object. The application trusts the identifier, not the identity. ...