source: http://www.securityfocus.com/bid/13426/info

Amazon Webstore is prone to a cross-site scripting vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input.

An attacker may leverage this issue to have arbitrary script code executed in the browser of an unsuspecting user. This may facilitate the theft of cookie-based authentication credentials as well as other attacks.

This issue reportedly affects Amazon Webstore version 04050100; other versions may also be vulnerable. 

http://www.example.com/index.php?function=search&searchFor=%22%3E%3Cscript%3Ealert(document.cookie)%3C/script%3E