Wordpress Photocrati Theme 'prod_id' Cross-Site Scripting Vulnerability

Summary
The host is installed with Wordpress Photocrati theme and is prone to cross-site scripting vulnerability.
Impact
Successful exploitation will allow remote attackers to execute arbitrary HTML and script code in a user's browser session in context of an affected site. Impact Level: Application
Solution
No solution or patch is available as of 22th January, 2015. Information regarding this issue will be updated once the solution details are available. For updates refer http://www.photocrati.com/
Insight
Flaw exists as input passed via the 'prod_id' GET parameter to /photocrati-theme/photocrati-gallery/ecomm-sizes.php script is not properly sanitised before being returned to the user.
Affected
Wordpress Photocrati theme version 4.7.3. Other versions may also be affected.
Detection
Send a crafted request via HTTP GET and check whether it is able to read cookie or not.
References