PmWiki 'from' Cross-Site Scripting Vulnerability

Summary
This host is running PmWiki and is prone to Cross Site Scripting vulnerabilities.
Impact
Successful exploitation will allow 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
Update to PmWiki version 2.2.21 or later For updates refer to http://www.pmwiki.org/pub/pmwiki/
Insight
Input passed to the 'from' parameter to 'pmwiki.php' is not properly sanitised before being returned to the user.
Affected
PmWiki version 2.2.20 and prior
References