RUNCMS 1.1A, and possibly other products based on e-Xoops (exoops), when "Allow custom avatar upload" is enabled, does not properly verify uploaded files, which allows remote attackers to upload arbitrary files.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20001
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1034
http://www.securityfocus.com/bid/13027
http://www.runcms.org/public/modules/news/