The file upload functionality in WordPress 3.1 before 3.1.3 and 3.2 before Beta 2, when running "on hosts with dangerous security settings," has unknown impact and attack vectors, possibly related to dangerous filenames.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-3097
http://www.securityfocus.com/bid/47995
http://www.debian.org/security/2012/dsa-2470