ClipperCMS 1.3.3 does not have CSRF protection on its kcfinder file upload which is being used by default. This can be used by an attacker to perform actions for an admin (or any user with file upload capability). With this vulnerability, it can automatically upload file/s (by default it allows aac,au,avi,css,cache,doc,docx,gz,gzip,htm,html,js,mp3,mp4,mpeg,mpg,ods,odp,odt,pdf,ppt,pptx,rar,tar,tgz,txt,wav,wmv,xls,xlsx,xml,z,zip as file types). Note that web shell that can be used for remote code execution can be achieved depending on the file types being accepted. Uploaded file can be accessed publicly on the "/assets/files" directory (e.g. uploaded a malicious html file with filename: poc.html file => http://<clipperwebsite>/clipper/assets/files/poc.html). This can lead for the website to be host unintended file/s.