Insecure Direct Object Reference: IDOR Explained
What IDOR vulnerabilities are, how attackers exploit sequential IDs to access others' data, and how authorization checks prevent it.
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Tags: security, attacks, owasp
IDOR: Insecure Direct Object Reference Attacks and Prevention Insecure Direct Object Reference (IDOR) is one of the most common and most damaging vulnerabilities in web applications. The OWASP Top 10 includes it under Broken Access Control — the number one vulnerability category. The concept is simple: an application uses a user-supplied value (typically an ID) to directly reference an object, without checking whether the requesting user is authorized to access that object. What IDOR Looks Like A user views their invoice at: The user changes to : If the server returns invoice 1235 — which belongs to a different user — that is an IDOR vulnerability. The server authenticated the request (the token is valid) but failed to authorize it (User A does not own invoice 1235). Real-World IDOR…
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