How to Fix Auth Middleware Bypass in AI-Built Apps
Authentication middleware can be bypassed, exposing protected routes. AI-generated auth checks often have logic gaps that allow unauthenticated access to sensitive endpoints.
Error messages you might see
Error: Unauthorized access detected on protected routeWarning: Auth middleware did not run for request path /api/adminWhy this happens in AI-generated code
Incomplete route matching
Middleware only checks exact paths, missing nested routes like /api/admin/users or routes with query params.
Missing method checks
AI code checks auth on GET requests but forgets to protect POST, PUT, or DELETE on the same endpoint.
Early return before auth check
Middleware has conditional logic that returns a response before the authentication check runs.
How to fix it
Use allowlist instead of blocklist
Protect all routes by default and explicitly allow public routes, rather than trying to block individual protected ones.
Apply auth at multiple layers
Check authentication in both middleware and individual route handlers as defense in depth.
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Frequently asked questions
How do I test for auth bypass vulnerabilities?
Try accessing protected routes without tokens, with expired tokens, and with tokens from different users. Test all HTTP methods.
Should I check auth in middleware or route handlers?
Both. Middleware provides a first line of defense, and route-level checks ensure protection even if middleware is misconfigured.
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