WordPress before 3.6.1 does not properly validate URLs before use in an HTTP redirect, which allows remote attackers to bypass intended redirection restrictions via a crafted string.
http://www.debian.org/security/2013/dsa-2757
http://wordpress.org/news/2013/09/wordpress-3-6-1/
http://seclists.org/fulldisclosure/2013/Dec/174
http://lists.fedoraproject.org/pipermail/package-announce/2013-September/117118.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-September/116832.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-September/116828.html