A vulnerability has been found and corrected in mailman:

Multiple cross-site scripting (XSS) vulnerabilities in Cgi/confirm.py
in GNU Mailman 2.1.14 and earlier allow remote attackers to inject
arbitrary web script or HTML via the (1) full name or (2) username
field in a confirmation message (CVE-2011-0707).

Packages for 2009.0 are provided as of the Extended Maintenance
Program. Please visit this link to learn more:
http://store.mandriva.com/product_info.php?cPath=149&products_id=490

The updated packages have been patched to correct this issue.