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Guide Explains IDOR/BOLA, the Top API Security Flaw, and How to Prove It Safely

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Broken Object Level Authorization, commonly called IDOR, ranks first on the OWASP API Security Top 10 (2023) and is a frequent serious flaw in modern APIs. The vulnerability arises when an application verifies that a user is logged in but fails to confirm that the specific object requested belongs to that user. A tutorial walks through how the flaw works, using an example of changing an invoice ID in a request, and describes where object references can appear in requests. It also covers how to test for the bug using two accounts the tester controls, so that no real user data is exposed. The guide emphasizes writing clear reports so that findings are taken seriously rather than dismissed.

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