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Bricxt SquadCybersecurity Education & Ethical Hacking Labs

IDOR Cheat Sheet

IDOR occurs when object access is based on user input without verifying authorization for that specific object.

Detection Clues

  • URLs with predictable object IDs
  • Missing server-side ownership checks
  • Access changes when ID changes only

Prevention

  • Check authorization at object level every request
  • Use RBAC/ABAC with deny-by-default policy
  • Log and alert on suspicious object access attempts

Copy-Ready Safe Test Case Pattern

GET /api/orders/{your_own_order_id}
Expected: 200 (authorized)

GET /api/orders/{different_user_order_id}
Expected: 403 (forbidden)

Real-Life Bug Pattern (Sanitized)

A billing dashboard relied on numeric invoice IDs in the URL and forgot object ownership checks in one endpoint. Users could read other customer invoices.