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How to prevent cross-site scripting security issues which returned in app scan as high vulnerability.
See the scan result below:
Entity: Parameter:ctl00$ContentPlaceHolder1$TabContainer1$TabPanel3$txtSearches
Risk(s): It is possible to steal or manipulate customer session and cookies, which might be used to impersonate a legitimate user,
allowing the hacker to view or alter user records, and to perform transactions as that user
Fix: Filter out hazardous characters from user input


After got the scan result I added regular expression validation to txtSearches textbox to block non-alphanumeric inputs and rescaned the application but again returned the same vulnerability.

1 solution

Relevant code/elements could be better to spot the issue. I think input going from some other way instead of that textbox.

There's a lot about this topic, check these articles
SQL Injection and Cross-Site Scripting[^]
Cross site scripting: Common threats in web applications[^]
An Absolute Beginner's Tutorial on Cross Site Scripting(XSS) Prevention in ASP.NET[^]

Also check these too
ASP.NET web application security review: Do's & Don'ts[^]
Security: It’s Getting Worse[^] - Great reading with more than bunch of stuff.
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prasy123 11-Dec-13 13:36pm    
Thanks thatraja..

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