ASP.NET Misconfiguration: Not Using Input Validation Framework

ASP.NET provides built-in validation frameworks, like the Validator controls or model validation with Data Annotations, which automate the enforcement of security rules. When developers bypass these frameworks and write custom validation manually, they often introduce inconsistencies, miss critical checks, or fail to properly sanitize data across all entry points. This creates gaps where attackers can inject malicious input. Without a centralized validation strategy, the application becomes vulnerable to common attacks like SQL injection, cross-site scripting (XSS), and command injection. Using the framework ensures validation is applied consistently, reduces human error, and leverages security features that are maintained and updated by the platform. Adopting a structured approach is essential for building a robust security posture from the ground up.