Access Control Is Every Request
Explain why every object access needs server-side authorization, even after authentication succeeds.
Access control fails when the server trusts the shape of the request more than the rights of the requester. The distinction that prevents IDOR Authentication proves identity. Authorization evaluates permission. Insecure direct object reference issues happen when an endpoint accepts an object identifier and assumes the authenticated user may access whatever object that identifier resolves to. The user may be real. The session may be fresh. The object may still belong to someone else. The server must decide every time OWASP recommends validating permissions on every request and denying by default. In practice, that means the server checks subject, object,…
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