An issue was discovered in Elefant CMS before 2.0.7. There is a PHP Code Execution Vulnerability in /designer/add/stylesheet.php by using a .php extension in the New Stylesheet Name field in conjunction with <?php content, because of insufficient input validation in apps/designer/handlers/csspreview.php.
https://github.com/jbroadway/elefant/releases/tag/elefant_2_0_7_stable
https://github.com/jbroadway/elefant/issues/286
https://github.com/jbroadway/elefant/commit/0795ab57c7ffa53ff4af57e229f6d9680fa54a21