Plupload before 1.5.4, as used in wp-includes/js/plupload/ in WordPress before 3.3.2 and other products, enables scripting regardless of the domain from which the SWF content was loaded, which allows remote attackers to bypass the Same Origin Policy via crafted content.
core.trac.wordpress.org/browser/branches/3.3/wp-includes/js/plupload/changelog.txt?rev=20487
core.trac.wordpress.org/browser/branches/3.3/wp-includes/js/plupload?rev=20487
osvdb.org/81461
secunia.com/advisories/49138
wordpress.org/news/2012/04/wordpress-3-3-2/
www.debian.org/security/2012/dsa-2470
www.plupload.com/punbb/viewtopic.php?id=1685
www.securityfocus.com/bid/53192
exchange.xforce.ibmcloud.com/vulnerabilities/75208
nealpoole.com/blog/2012/05/xss-and-csrf-via-swf-applets-swfupload-plupload/