GetSimple CMS 3.1 admin/pages.php error 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/pages.php?error=%22%3E%3Ciframe%20src=a%20onload=alert%28%22VL%22%29%20%3C