In Joomla! 3.2.0 through 3.6.5 (fixed in 3.7.0), inadequate MIME type checks allowed low-privilege users to upload swf files even if they were explicitly forbidden.Referenceshttps://developer.joomla.org/security-centre/689-20170407-core-acl-violationshttp://www.securityfocus.com/bid/98029
