OWASP Top 10: A Developer Guide to Web Application Security Risks

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The OWASP Top 10 is a periodically updated document by the Open Worldwide Application Security Project that ranks the most critical web application security risks based on real-world data and expert consensus. The current edition, last fully revised in 2021, covers ten vulnerability categories including Broken Access Control, Injection, Cryptographic Failures, and Server-Side Request Forgery. Broken Access Control ranks as the most prevalent category, occurring when users can act beyond their intended permissions — for example, accessing another user's data by manipulating a URL parameter. The guide provides .NET-specific code examples illustrating both vulnerable patterns and their secure counterparts, such as verifying resource ownership rather than just authentication status. Rather than a one-time checklist, OWASP frames the Top 10 as a shared vocabulary for recurring security mistakes seen across languages, frameworks, and organizations over decades of research.

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