source: http://www.securityfocus.com/bid/12631/info

PBLang is reportedly affected by a cross-site scripting vulnerability. This issue exists because the application fails to properly sanitize user-supplied input.

As a result of this vulnerability, it is possible for a remote attacker to create a malicious link containing script code that will be executed in the browser of an unsuspecting user when followed. This may facilitate the theft of cookie-based authentication credentials as well as other attacks. 

http://www.example.com/search.php?s=<script language="javascript">alert("");</script>