I'm guessing that your application is having an XSRF (cross-site resource forgery) problem. Take a look at http://www.cgisecurity.com/articles/csrf-faq.shtml for some more details on what this is and how to block it. Short answer is adding a URL "crumb" which is unique and can only have been generated by your site. This is embedded in the URL itself, not the form, so XSRF techniques can't steal it -- this is way oversimplifying this, but it's basically the answer. You will of course also have to make sure you're not vulnerable to XSS (cross-site-scripting) attacks as well.

In reply to Re: Detecting redirect fraud? by pemungkah
in thread Detecting redirect fraud? by Anonymous Monk

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