osCSS 'page' Parameter Cross Site Scripting Vulnerability

Summary
The host is running osCSS and is prone to cross site scripting vulnerability.
Impact
Successful exploitation could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data. Impact Level: Application
Solution
No solution or patch was made available for at least one year since disclosure of this vulnerability. Likely none will be provided anymore. General solution options are to upgrade to a newer release, disable respective features, remove the product or replace the product by another one.
Insight
The flaw is caused by improper validation of user-supplied input via the 'page' parameter in 'admin/currencies.php' that allows the attackers to execute arbitrary HTML and script code in the context of an affected site.
Affected
osCSS Version 1.2.2 and prior.
References