Omeka is a free, flexible, and open source web-publishing platform for the display of library, museum, archives, and scholarly collections and exhibitions. Its 'five-minute setup' makes launching an online exhibition as easy as launching a blog.
Omeka suffers from an authenticated arbitrary PHP code execution. The vulnerability is caused due to the improper verification of uploaded files in '/admin/items/add' script thru the 'file[0]' POST parameter. This can be exploited to execute arbitrary PHP code by uploading a malicious PHP script file that will be stored in '/files/original' directory after successfully disabling the file validation option (or adding something like 'application/x-php' into the allowed MIME types list) and bypassing the rewrite rule in the '.htaccess' file with '.php5' extension.