Authentication & Access Control

IDOR — Broken Access Control

Learn how to access other users' data by manipulating object references — one of the most common and impactful vulnerabilities in web applications.

Beginner50 min11 lessons3 hands-on

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First lesson free. The full module is part of Pro.

You'll be able to

✓Understand how insecure direct object references expose unauthorised data
✓Find IDOR in URL parameters, JSON bodies, and HTTP headers
✓Enumerate object IDs to access other users' resources
✓Escalate IDOR from read access to modification and deletion

Lessons

1The Student Who Read 50,000 People's Grades
2What is IDOR?HANDS-ON
3Finding IDOR Vulnerabilities
4IDOR Beyond Numeric IDs
5Your Turn: Walk the IDsHANDS-ON
6IDOR in APIs — REST, GraphQL, and Chained Impact
7Real-World Impact
8Tool — ffuf
9Module quiz
10Prevention & Secure Code
11Hands-on Lab: Exploit HexapayHANDS-ON