Module 5: IDOR Explained The "Simple" Bug That Exposed Millions
In this deep dive, we explore Insecure Direct Object Reference (IDOR)—a critical security flaw that allows attackers to bypass authorization and access sensitive data just by changing a single parameter. Although it's often considered a "simple" bug, IDOR is a major part of Broken Access Control, which currently sits at the top of the OWASP Top 10.
What You Will Learn:
The Difference Between Authentication & Authorization: Why being "logged in" isn't enough to keep data safe.
Real-World Case Studies: How sequential IDs led to the infamous Parler breach and how a researcher found an IDOR in Shopify using filename manipulation.
Common Attack Vectors: We break down URL tampering, Body Manipulation, and Mass Assignment.
Expert Remediation: Why you must implement server-side access control for every object and how UUIDs can serve as a defense-in-depth measure.
Resources Mentioned:
OWASP IDOR Prevention Cheat Sheet
HackerOne: The Rise of IDOR
MDN Web Security Documentation
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