Cross-site scripting (XSS) vulnerability in the media-playlists feature in WordPress before 3.9.x before 3.9.3 and 4.x before 4.0.1 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
https://wordpress.org/news/2014/11/wordpress-4-0-1/
http://www.securitytracker.com/id/1031243
http://www.securityfocus.com/bid/71236
http://www.mandriva.com/security/advisories?name=MDVSA-2014:233