What is a validation error and how can such an error lead to

What is a validation error, and how can such an error lead to a security flaw?

Solution

Validation errors are the errors which causes due to inappropriate validations. Validations are mainly used in a program if needs some kind of interaction with any other external system or environments. Validation mainly is required to three items, they are: the input, the origin and the target.

The input needs to be validated to ensure that the input data is what we are expecting, it includes the validation of each data format, type and number. It should avoid bad input data which may cause malfunctioning of the program and may ends up crashing the system.

The origin should be validated such that it should check the identity of the origin, thus preventing some un authorized access to the system.

The target validation is that which verifies the target is the intended person or place where the output supposed to go, thus the target validation can prevent un authorized users wont get the system results.