best practices to secure ASP.NET Core APIs against modern attacks

Question

What are the best practices to secure ASP.NET Core APIs against modern attacks?

Rajesh Gami · Answer

Refer these articles for the better understanding https://www.c-sharpcorner.com/article/best-practices-for-securing-your-asp-net-core-mvc-application/ https://www.c-sharpcorner.com/article/securing-net-core-applications-best-practices-and-techniques/ https://www.c-sharpcorner.com/article/securing-connection-strings-and-appsettings-in-asp-net-core/

Sandhiya Priya · Answer

Best Practices to Secure ASP.NET Core APIs Against Modern Attacks Use HTTPS Everywhere Enforce HSTS and disable weak TLS versions. Strong Authentication & Authorization Use OAuth2/OpenID Connect, JWT access tokens, refresh tokens, and role/claims-based authorization. Input Validation & Model Binding Security Validate all inputs using FluentValidation/Data Annotations; never trust client data. Rate Limiting & Throttling Protect from DDoS, brute force, bot attacks (use ASP.NET Core rate limiting middleware). Secure JWT Handling Use short-lived tokens, rotate signing keys, and verify audience/issuer strictly. API Key & Secret Management Don’t store secrets in appsettings.json; use Azure Key Vault / AWS Secrets Manager. CORS Hardening Allow only specific domains; never use AllowAnyOrigin . Output Encoding & XSS Protection Always encode outputs; use proper content types. SQL Injection Protection Use parameterized queries and EF Core; block raw SQL from external input. Transport & Data Encryption Encrypt sensitive data at rest and in transit. Logging & Monitoring Enable structured logging, audit logs, and alerts for suspicious activity. Security Headers Apply headers like CSP, X-Frame-Options, X-Content-Type-Options. Zero Trust & Least Privilege Limit database permissions, network access, and role privileges. Use Reverse Proxy & WAF NGINX/Azure Front Door/Cloudflare to filter malicious requests before API hits.

best practices to secure ASP.NET Core APIs against modern attacks

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