The code in mysqldump_download.php doesn't check that the requested file is within the intended download directory: try{ $dbname = $_GET["dbname"]; $dumpfname = $_GET["dumpfname"]; $backup_folder = $_GET["backup_folder"]; }catch (Exception $e){} if(empty($backup_folder)){ $backup_folder="backup/"; } echo "$dumpfname"; if (file_exists($dumpfname)) { // zip the dump file $name=$dbname . "_" . date("Y-m-d"); $zipfname = $backup_folder.$name.".zip"; $zip = new ZipArchive(); if($zip->open($zipfname,ZIPARCHIVE::CREATE)) { $zip->addFile($dumpfname,$dumpfname); $zip->close(); } // read zip file and send it to standard output if (file_exists($zipfname)) { header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename='.basename($zipfname)); flush(); readfile($zipfname);