Cybersecurity for .NET developers

Security has become a central part of everyday development work. Even if you are not a security specialist, modern .NET applications touch many areas that have strong security implications: authentication flows, cloud permissions, logging, data protection, configuration handling, API design and much more. That said, .NET is a secure platform to develop on, if you follow the rules.

If you want to understand today's cybersecurity landscape from a developer's perspective, there are a few well-known resources that are worth bookmarking. These do not require a security background; they are written for engineers who build real systems.

There are two lists to take a note: the simpler, and better known "OWASP Top Ten", and the more comprehensive "MITRE ATT&CK" framework. Let's explore both briefly.

OWASP (the Open Web Application Security Project) publishes the Top Ten list, which is probably the most practical and developer-friendly summary of common web application risks. The categories evolve every few years, but topics like injection, authentication problems and insecure design are always present.

I find the official documentation worth reading, and it also includes concrete (code) examples and mitigation patterns. If you only read one thing about security this year, this is a good candidate.

While OWASP focuses on application design, MITRE ATT&CK focuses on how attackers think and operate. It maps techniques used by real threat actors across different phases: initial access, privilege escalation, persistence, movement across systems, and so on.

This is not something you memorize, but it helps to understand the "bigger map" of security and why certain logs, configurations or access rights matter.

Finally, there's the .NET and ASP.NET Core security documentation. Microsoft has significantly improved its security documentation in the last few releases. Topics such as data protection, secure cookies, authentication handlers, CORS, rate limiting and HTTPS configuration are explained in clear articles that also include code.

Much of this is directly relevant for everyday development work, especially now that ASP.NET Core is used for everything from small APIs to enterprise systems.

Finally, there are automated scanning tools, but also AI. Tools like GitHub Advanced Security (including CodeQL), Microsoft's security analyzers and even the built-in Visual Studio warnings can catch common mistakes early: unsafe deserialization, missing input validation, untrusted paths and weak cryptographic usage. AI, for example in the form of GitHub Copilot, can also be asked to review code security issues. If you are working in a team, such automated scanning is an easy win.

Most .NET systems today run in cloud environments with broad attack surfaces: public APIs, distributed services, multiple identities and complex configuration flows. Understanding the basic security landscape helps you make better design decisions and recognize red flags before they reach production.

You do not need to become a security engineer, but having these resources on your radar makes you a stronger and more aware developer.

Happy security learning!