Ajaxeplorer before 5.0.1 allows remote attackers to execute arbitrary commands via shell metacharacters in the (1) archive_name parameter to the Power FS module (plugins/action.powerfs/class.PowerFSController.php), a (2) file name to the getTrustSizeOnFileSystem function in the File System (Standard) module (plugins/access.fs/class.fsAccessWrapper.php), or the (3) revision parameter to the Subversion Repository module (plugins/meta.svn/class.SvnManager.php).