The default configuration of WordPress before 3.6.1 does not prevent uploads of .swf and .exe files, which might make it easier for remote authenticated users to conduct cross-site scripting (XSS) attacks via a crafted file, related to the get_allowed_mime_types function in wp-includes/functions.php.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2013-5576
http://www.debian.org/security/2013/dsa-2757
http://wordpress.org/news/2013/09/wordpress-3-6-1/