OWASP A01: Broken Access Control (1) — IDOR, Admin Endpoints and Authorization in ASP.NET Core
Logged in as Alan, we read Grace's order by changing the order number and pull every user from an admin endpoint whose role check was forgotten. We show both flaws in the lab and close them with policies, resource-based authorization through IAuthorizationService and a deny-by-default fallback policy, and discuss choosing between 403 and 404 and the .NET 10 change to cookie redirects.
6 Nov 2026
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11 min
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5
