Cross-site scripting (XSS) vulnerability in the phpinfo function in PHP 4.2.3 allows remote attackers to inject arbitrary web script or HTML via the query string argument, as demonstrated using soinfo.php.
http://www.techie.hopto.org/vulns/2002-36.txt
http://www.iss.net/security_center/static/10355.php
http://archives.neohapsis.com/archives/vulnwatch/2002-q4/0021.html