The WP-DBManager (aka Database Manager) plugin before 2.7.2 for WordPress allows remote authenticated users to execute arbitrary commands via shell metacharacters in the (1) $backup['filepath'] (aka "Path to Backup:" field) or (2) $backup['mysqldumppath'] variable.
https://wordpress.org/plugins/wp-dbmanager/changelog/
https://exchange.xforce.ibmcloud.com/vulnerabilities/97689
http://www.securityfocus.com/bid/70626
http://www.securityfocus.com/archive/1/533763/100/0/threaded