cross site scripting vulnerability in BLOG:CMS

[advisory@xxxxxxxxxxx]

Vulnerability ID: HTB22726
Reference: 
http://www.htbridge.ch/advisory/cross_site_scripting_vulnerability_in_blogcms.html
Product: BLOG:CMS
Vendor: Radek Hulán ( http://blogcms.com/ ) 
Vulnerable Version: 4.2.1.e and probably prior versions
Vendor Notification: 30 November 2010 
Vulnerability Type: XSS (Cross Site Scripting)
Status: Fixed by Vendor
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing 
(http://www.htbridge.ch/) 

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "admin/index.php" script to 
properly sanitize user-supplied input in "action" variable. Successful 
exploitation of this vulnerability could result in a compromise of the 
application, theft of cookie-based authentication credentials, disclosure or 
modification of sensitive data.

An attacker can use browser to exploit this vulnerability. The following PoC is 
available:
http://host/admin/index.php?action=settingsedit";><script>alert(document.cookie)</script>
Solution: Upgrade to the most recent version