Multiple vulnerabilities has been found and corrected in mailman:

Multiple cross-site scripting (XSS) vulnerabilities in GNU Mailman
before 2.1.14rc1 allow remote authenticated users to inject arbitrary
web script or HTML via vectors involving (1) the list information
field or (2) the list description field (CVE-2010-3089).

Packages for 2008.0 and 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 these issues.