Dream CMS allows users to perform certain actions via HTTP requests without performing any validity checks to verify the requests. This can be exploited to perform certain actions with administrative privileges if a logged-in user visits a malicious web site. Related to the CSRF issue, an authenticated arbitrary PHP code execution exist. The vulnerability is caused due to the improper verification of uploaded files in ‘/files-manager-administration/add-file’ script via the ‘file’ POST parameter which allows of arbitrary files being uploaded in ‘/resource/filemanager/1/home/’ where the admin first needs to add the file extension in the allowed list (csrf’d). This can be exploited to execute arbitrary PHP code by uploading a malicious PHP script file and execute system commands. Version 2.3.0 is affected.