Cross-site scripting (XSS) vulnerability in vendors/samswhois/samswhois.inc.php in the Whois Search plugin before 1.4.2.3 for WordPress allows remote attackers to inject arbitrary web script or HTML via the domain parameter, a different vulnerability than CVE-2011-5193.
https://exchange.xforce.ibmcloud.com/vulnerabilities/72074
http://wordpress.org/extend/plugins/wordpress-whois-search/changelog/