Invicti detected that MAC validation is disabled in ViewState data.

An attacker can tamper with the application's state variables located in the ViewState data structure.

ASP.NET uses a hash code-based integrity solution called "ViewStateMac" to protect ViewState parameters against tampering attacks. You can implement this solution on a page or application level.

1. For page-based protection, place the following directive at the top of affected page.<%@Page EnableViewStateMAC=true %>
   
2. You can also set this option for the whole application by using web.config files. Apply the following configuration for your application's web.config file.<System.Web>
   <pages enableViewStateMac="true">
   </System.Web>