How Does ValidateAntiForgeryToken Prevent CSRF Attacks in ASP.NET MVC 4?

ValidateAntiForgeryToken: Purpose, Explanation, and Example in MVC 4

In MVC applications, it's critical to protect against malicious form submissions known as cross-site request forgery (CSRF). The ValidateAntiForgeryToken attribute plays a vital role in addressing this issue.

Purpose of ValidateAntiForgeryToken

The ValidateAntiForgeryToken attribute generates a unique token that is stored in an HTTP-only cookie. This same token is also added to the form as a hidden input. When the form is submitted, ASP.NET MVC verifies that the cookie value and form token value match. If they don't match, the action method call will fail, preventing the unintended submission.

Example of Usage in MVC 4

To use the ValidateAntiForgeryToken attribute, you would apply it to your controller actions or the entire controller as follows:

[ValidateAntiForgeryToken]
public class HomeController : Controller
{
    ...
}

Within the form that submits to the controller action, you need to include the following code:

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    ... (form elements)
}

By implementing the ValidateAntiForgeryToken attribute and calling @Html.AntiForgeryToken(), you can protect your MVC application from CSRF attacks.

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