concrete5 index.php/tools/required/files/permissions searchInstance Parameter XSS

source: http://www.securityfocus.com/bid/53640/info
    
Concrete CMS is prone to following vulnerabilities because it fails to properly handle user-supplied input.
    
1. Multiple cross-site scripting vulnerabilities
    
2. An arbitrary-file-upload vulnerability
    
3. A denial-of-service vulnerability
    
An attacker may leverage these issues to cause denial-of-service conditions or to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker to steal cookie-based authentication credentials and to launch other attacks.
    
Concrete CMS versions 5.5 and 5.5.21 are vulnerable. 

http://www.example.com/learn/concrete/concrete5.5.2.1/index.php/tools/required/files/permissions?searchInstance="><script>alert("AkaStep");</script>&fID=owned