Kliqqi-CMS has a background arbitrary code execution vulnerability that attackers can exploit to implant backdoors or getShell via the edit_page.php component.
Kliqqi 3.0.0.5 allows CSRF with resultant Arbitrary File Upload because module.php?module=upload can be used to configure the uploading of .php files, and then modules/upload/upload_main.php can be used for the upload itself.