CruxCMS 'txtusername' Parameter Cross Site Scripting Vulnerability

Summary
This host is running CruxCMS and is prone to cross site scripting vulnerability.
Impact
Successful exploitation will allow remote attackers to cause arbitrary scripting code to be executed by the user's browser in the security context of an affected site. 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 an input validation error in the 'manager/login.php' script when processing the 'txtusername' parameter.
Affected
CruxCMS version 3.0
References