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Security implications of CORS?

Q: Security implications of CORS?

Short answer: Improperly configured CORS can expose your API to CSRF and data theft. Avoid using AllowAnyOrigin with AllowCredentials as browsers block it. Restrict origins to trusted domains. Validate CORS headers and avoid overly permissive policies. Use HTTPS to secure cross-origin requests. Cross‑Cutting / Advanced / “Miscellaneous” Real-world example (ShopNest) A ShopNest checkout request flows through middleware, hits a minimal API or controller, uses scoped services, and returns ProblemDetails on errors. Say this in the interview Define — one clear sentence (the short answer above). Example — relate it to a project like ShopNest or your real work. Trade-off — when you would not use it.

Short answer: Improperly configured CORS can expose your API to CSRF and data theft. Avoid using AllowAnyOrigin with AllowCredentials as browsers block it. Restrict origins to trusted domains. Validate CORS headers and avoid overly permissive policies. Use HTTPS to secure cross-origin requests. Cross‑Cutting / Advanced / “Miscellaneous”

Real-world example (ShopNest)

A ShopNest checkout request flows through middleware, hits a minimal API or controller, uses scoped services, and returns ProblemDetails on errors.

Say this in the interview

Define — one clear sentence (the short answer above).
Example — relate it to a project like ShopNest or your real work.
Trade-off — when you would not use it.

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