OpenEMR before 5.0.2 is vulnerable to local file inclusion via the fileName parameter in custom/ajax_download.php. An attacker can download any file (that is readable by the web server user) from server storage. If the requested file is writable for the web server user and the directory /var/www/openemr/sites/default/documents/cqm_qrda/ exists, the file will be deleted from server.
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