Cross-site scripting (XSS) vulnerability in mod_lettermansubscribe.php in the Letterman Subscriber (mod_letterman) before 1.2.5 module for Joomla! allows remote attackers to inject arbitrary web script or HTML via the Itemid parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/34870
http://www.vupen.com/english/advisories/2007/2215