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.
https://nealpoole.com/blog/2012/05/xss-and-csrf-via-swf-applets-swfupload-plupload/
https://exchange.xforce.ibmcloud.com/vulnerabilities/75208
http://www.securityfocus.com/bid/53192
http://www.plupload.com/punbb/viewtopic.php?id=1685
http://www.debian.org/security/2012/dsa-2470
http://wordpress.org/news/2012/04/wordpress-3-3-2/
http://secunia.com/advisories/49138
http://core.trac.wordpress.org/browser/branches/3.3/wp-includes/js/plupload?rev=20487
http://core.trac.wordpress.org/browser/branches/3.3/wp-includes/js/plupload/changelog.txt?rev=20487