DedeCMS through V5.7SP2 allows arbitrary file upload in dede/file_manage_control.php via a dede/file_manage_view.php?fmdo=upload request with an upfile1 parameter, as demonstrated by uploading a .php file.
DedeCMS through 5.7SP2 allows arbitrary file write in dede/file_manage_control.php via a dede/file_manage_view.php?fmdo=newfile request with name and str parameters, as demonstrated by writing to a new .php file.
DedeCMS through 5.6 allows arbitrary file upload and PHP code execution by embedding the PHP code in a .jpg file, which is used in the templet parameter to member/article_edit.php.
Multiple SQL injection vulnerabilities in DeDeCMS, possibly 5.6, allow remote attackers to execute arbitrary SQL commands via the id parameter to (1) list.php, (2) members.php, or (3) book.php.