Question

Which of the following is the most common web application security flaw?

A: Failure to validate output
B: Failure to validate input
C: Dynamic data validation
D: Static data validation

Answer 1

The most common web application security flaw is failure to validate input.

Step-by-step explanation:

The most common web application security flaw among the options given is failure to validate input. Input validation is a crucial step in ensuring the security of web applications because it helps prevent malicious users from injecting harmful data or code into the system.

By failing to validate input, web applications become vulnerable to various attacks such as SQL injection and cross-site scripting (XSS). In an SQL injection attack, an attacker can manipulate a web application's database by injecting SQL queries through input fields. XSS attacks, on the other hand, involve injecting malicious scripts into web pages that can steal user data or enable unauthorized actions.

Proper input validation involves checking user input for expected patterns, length restrictions, and sanitizing it to prevent code execution. By implementing secure coding practices and using input validation techniques, web application developers can safeguard their systems from one of the most common security flaws.