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Editorial Team
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Asked: 2026-05-25T11:17:36+00:00

I just did a quick test with a simple ASP.NET MVC 3 sample by

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I just did a quick test with a simple ASP.NET MVC 3 sample by modifying default LogOn form. According to this article, both hidden field __RequestVerificationToken and cookies __RequestVerificationToken_Lw__ must contain same value that generated by Html.AntiForgeryToken(). But it isn’t exactly same when I got them in Fiddle, by the way, looking at MVC 3 source code, method GetAntiForgeryTokenAndSetCookie seemed not use salt value for generating the cookies. Was there any change in MVC 3?

Forgot to say that I could still log on successfully with both normal or Ajax POST request.

Here is raw log from Fiddle:

POST http://localhost:51713/Account/LogOn HTTP/1.1
Referer: http://localhost:51713/Account/LogOn
Content-Length: 256
Origin: http://localhost:51713
X-Requested-With: XMLHttpRequest
Content-Type: application/x-www-form-urlencoded
Cookie: __RequestVerificationToken_Lw__=OIRtVqUvNt/LfDGeoVy3W1VhdKN7MwdbUZmRNScz4NqS4uV0I0vQH2MHg77SsVhcinK5SJi9mVcdBUWk2VMiPTk8EMUN2Zq0X4ucK8XQ3/zr6NoiIvVF73Bq8ahbFaY/IrNrWY7mmzvO9j/XVLNN2lNqgCd6I3UGZAw3/nlOmpA=

__RequestVerificationToken=zeDS%2F8MZE%2BLf%2FrRhevwN51J7bOE3GxlGNLQc8HogwFctF7glU1JboHePTTHa5YFe9%2FD2sY7w167q53gqvcwYZG1iZeecdnO4fdg6URdR4RUR%2BjIgk1apkXoxQ2xg48REfv4N5D4SHKU4MAf30Diy0MVyyF9N2Dl7uUGT6LbKHZU%3D&UserName=Tien&Password=tien&RememberMe=false
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1 Answer

  1. Editorial Team

    what makes you think they should be the same ? 🙂 of course, they must me comparable in some way, but that doesnt mean they must look identical in their serialized form. There is different set of data serialized to cookie (i think only the “salt” and token) and to HTML markup (salt, token, creation time, username).

    If you are interested in details, take ILSpy and look for System.Web.Mvc.AntiForgeryDataSerializer, System.Web.Mvc.AntiForgeryData and OnAuthorization method of System.Web.Mvc.ValidateAntiForgeryTokenAttribute

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