Viewstate tampering is a type of web application attack that involves modifying the __VIEWSTATE field of a web page in order to execute malicious code or gain unauthorized access to sensitive data.__ The __VIEWSTATE field__ contains the current state of the web page, including form data, user input, and other information that is necessary for the page to function properly. By modifying the __VIEWSTATE field__, an attacker can bypass security measures and gain control of the web page.
There are several methods that can be used to check for viewstate tampering, including: