WHMCS SQL Injection Vulnerability

Summary
This host is installed with WHMCS and is prone to sql injection vulnerability.
Impact
Successful exploitation will allow remote attackers to disclose credentials or manipulate SQL queries by injecting arbitrary SQL code. Impact Level: Application
Solution
Upgrade to WHMCS 5.2 or later, For updates refer to http://www.whmcs.com
Insight
Flaw is due to improper sanitation of user supplied input via the 'id' parameter to '/whmcs/dl.php' script.
Affected
WHMCS version 4.5.2 and prior
References