DedeCMS through V5.7SP2 allows arbitrary file upload in dede/album_edit.php or dede/album_add.php, as demonstrated by a dede/album_edit.php?dopost=save&formzip=1 request with a ZIP archive that contains a file such as "1.jpg.php" (because input validation only checks that .jpg, .png, or .gif is present as a substring, and does not otherwise check the file name or content).
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.
include/userlogin.class.php in DeDeCMS 5.5 GBK, when session.auto_start is enabled, allows remote attackers to bypass authentication and gain administrative access via a value of 1 for the _SESSION[dede_admin_id] parameter, as demonstrated by a request to uploads/include/dialog/select_soft_post.php.