GetSimple CMS 3.1 admin/index.php Multiple Parameter Reflected XSS

source: http://www.securityfocus.com/bid/53501/info
  
GetSimple CMS is prone to HTML-injection and cross-site scripting vulnerabilities because it fails to properly sanitize user-supplied input before using it in dynamically generated content.
  
Successful exploits will allow attacker-supplied HTML and script code to run in the context of the affected browser, potentially allowing the attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user. Other attacks are also possible.
  
GetSimple CMS 3.1 is vulnerable; other versions may also be affected. 

http://www.example.com/getsimple/admin/index.php?success=%3E%22%3Ciframe%20src=http://www.vulnerability-lab.com%20width=800%20height=800%3E
http://www.example.com/getsimple/admin/index.php?err=%3E%22%3Ciframe%20src=http://www.vulnerability-lab.com%20width=800%20height=800%3E