Testing for XSS vulnerabilities when URl contains hidden fields -


i checking xss vulnerabilities portal. examples found on internet says that, if have url 

http://www.yoursite.com/index.html?name=george

try encoding 

http://www.yoursite.com/index.html?name=<script>alert('you found xss vulnerability')</script>

and if find alert , show portal xss vulnerable. question url doesn't contains variable , using hidden fields url looks 

http://[myip]:8080/appshop-v1/appstoreregistration.html

and doesn't changes on post or operation .how can insert script in such scenario , check vulnerabilities.

the basic safety tells should not trust input coming user , can use tools fiddler , manipulate hidden field value also. if using value output on portal name etc...do html encode before outputting it. xss not limited querystring , can coming user. advisable should not store sensitive information in hidden field because end user can see , change .


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