Cross-site scripting (XSS) vulnerability in index.php in Aardvark Topsites PHP 5.2.0 and earlier allows remote attackers to inject arbitrary web script or HTML via the q parameter in a search action. NOTE: it was later reported that 5.2.1 is also affected.
https://exchange.xforce.ibmcloud.com/vulnerabilities/51391
http://www.securityfocus.com/archive/1/514423/100/0/threaded
http://www.securityfocus.com/archive/1/504574/100/0/threaded
http://websec.id3as.com/aardvark-topsites-php-521-security-vulnerabilities-disclosure/