WordPress Register Plus Plugin Multiple Vulnerabilities

Summary
The host is running WordPress Register Plus Plugin and is prone to multiple vulnerabilities.
Impact
Successful exploitation could allow an attacker to execute arbitrary HTML and script code in a user's browser session in the 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 flaws are due to, - Input passed via the 'firstname', 'lastname', 'website', 'aim', 'yahoo', 'jabber', 'about', 'pass1', and 'pass2' parameters to 'wp-login.php' (when 'action' is set to 'register') is not properly sanitised before being returned to the user. - A direct request to 'dash_widget.php' and 'register-plus.php' allows remote attackers to obtain installation path in an error message.
Affected
WordPress Register Plus 3.5.1
References