The Rise of IDOR

This report explains Insecure Direct Object Reference (IDOR) vulnerabilities—how they arise (e.g., URL tampering, body manipulation, improper handling of HTTP verbs, mass assignment), real-world examples (Shopify file-replacement submission and Parler post enumeration), their prevalence across industries, potential impacts (data exposure, unauthorized modification), and recommended mitigations such as robust access control, parameter validation, scoping queries to resource owners, and use of tokenization/salted identifiers.