source: http://www.securityfocus.com/bid/38732/info

Multiple products are prone to a cross-site scripting vulnerability because the applications fail to properly sanitize user-supplied input.

An attacker may leverage this issue to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may help the attacker steal cookie-based authentication credentials and launch other attacks.

The following products are affected:

phpAdsNew
OpenAds
OpenX 

http://www.example.com/path/banner.swf?clickTAG=javascript:alert('XSS')