An updated mailman package that corrects a cross-site scripting flaw is now available. This update has been rated as having important security impact by the Red Hat Security Response Team.
Mailman manages electronic mail discussion and e-newsletter lists. A cross-site scripting (XSS) flaw in the driver script of mailman prior to version 2.1.5 could allow remote attackers to execute scripts as other web users. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-1177 to this issue. Users of mailman should update to this erratum package, which corrects this issue by turning on STEALTH_MODE by default and using Utils.websafe() to quote the html.