Cross-site scripting (XSS) vulnerability in the wptexturize function in WordPress before 3.7.5, 3.8.x before 3.8.5, and 3.9.x before 3.9.3 allows remote attackers to inject arbitrary web script or HTML via crafted use of shortcode brackets in a text field, as demonstrated by a comment or a post.
https://wordpress.org/news/2014/11/wordpress-4-0-1/
http://www.securitytracker.com/id/1031243
http://www.securityfocus.com/bid/71237
http://www.mandriva.com/security/advisories?name=MDVSA-2014:233
http://www.debian.org/security/2014/dsa-3085
http://seclists.org/fulldisclosure/2014/Nov/62
http://openwall.com/lists/oss-security/2014/11/25/12