Missing Validation on User Input

Description

The application is lacking proper validation on user input fields, allowing users to submit invalid or malicious data. We need to implement robust input validation to prevent security vulnerabilities and ensure data integrity.

Steps to Reproduce

1. Attempt to submit a form with invalid input data.
2. Notice that the form is accepted without displaying any error messages.

Expected Behavior

The application should validate user input and display appropriate error messages for any invalid or malicious data submitted by users.