Without input validation, a user might take advantage of applications like setuid executables or web applications like CGIs to make them act badly by feeding them different kinds of data.
Format string vulnerabilities may be caused by this kind of issue. Any harmful action against a computer system that involves manually putting odd data into a typical user input field is known as an input validation attack. The user may see client-side validation in action. It entails using JavaScript for input form validation. A JavaScript validator, for instance, would provide an error if anything was submitted that did not conform to a phone number or email if the input was submitted for a phone number or email.
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