Hastymail2 'rs' Parameter Cross Site Scripting Vulnerability

Summary
The host is running Hastymail2 and is prone to cross-site scripting vulnerability.
Impact
Successful exploitation will allow remote attackers to insert arbitrary HTML and script code, which will be executed in a user's browser session in the context of an affected site. Impact Level: Application
Solution
Upgrade to Hastymail2 version 2.1.1 RC2 or later, For updates refer to http://www.hastymail.org/downloads/
Insight
The flaw is due to improper validation of user-supplied input via the 'rs' parameter to index.php (when 'page' is set to 'mailbox' and 'mailbox' is set to 'Drafts'), which allows attackers to execute arbitrary HTML and script code in a user's browser session in the context of an affected site.
Affected
Hastymail2 version 2.1.1
References