The Yahoo! UI framework exchanges data using JavaScript Object Notation (JSON) without an associated protection scheme, which allows remote attackers to obtain the data via a web page that retrieves the data through a URL in the SRC attribute of a SCRIPT element and captures the data using other JavaScript code, aka "JavaScript Hijacking."
https://euvd.enisa.europa.eu/vulnerability/EUVD-2007-2380
http://www.fortifysoftware.com/servlet/downloads/public/JavaScript_Hijacking.pdf