GNU Mailman allowed arbitrary content injection via the Cgi/private.py private archive login page.
For Debian 8 Jessie
, this problem has been fixed in version
1:2.1.18-2+deb8u7.
We recommend that you upgrade your mailman packages.
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS