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Automating IDOR Detection: Writing Custom Nuclei Templates for Business Logic Vulnerabilities

  Standard Dynamic Application Security Testing (DAST) tools are notoriously bad at detecting Insecure Direct Object References (IDOR). Tools like OWASP ZAP or Arachni typically operate on a fuzzing basis—they throw garbage data at inputs and look for crashes or 500 errors. They fail at IDORs because an IDOR is not a syntactic error; it is a logic error. If User A requests User B’s invoice and the server returns a 200 OK with the invoice data, a generic scanner interprets this as a successful, valid request. It lacks the context to know that User A  should not  have access to that data. Reliance on manual testing (Burp Suite Repeater) for these checks introduces a bottleneck. As you move towards continuous deployment, you need a way to codify "User A accessing User B data" into a regression test that runs on every commit. The Root Cause: Context-Blind Authorization Under the hood, most web frameworks separate  Authentication  (Who are you?) from  Authorizat...