DedeCMS through V5.7SP2 allows arbitrary file upload in dede/albumedit.php or dede/albumadd.php, as demonstrated by a dede/albumedit.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).

A file upload issue exists in DeDeCMS before 5.7-sp1, which allows malicious users getshell.

DedeCMS through 5.7SP2 allows arbitrary file write in dede/filemanagecontrol.php via a dede/filemanageview.php?fmdo=newfile request with name and str parameters, as demonstrated by writing to a new .php file.

DedeCMS through V5.7SP2 allows arbitrary file upload in dede/filemanagecontrol.php via a dede/filemanageview.php?fmdo=upload request with an upfile1 parameter, as demonstrated by uploading a .php file.