What is Input Validation in Cybersecurity?

Missing or weak input validation is the root cause of injection attacks, cross-site scripting, and buffer overflows. Penetration testers probe input fields to find validation gaps. Security engineers define validation rules and review code for proper implementation. Input validation is one of the first topics covered in application security training.

Cybersecurity professionals who work with Input Validation include Penetration Tester, Security Engineer, Security Architect. These roles apply Input Validation knowledge within the Application Security domain.