/options/mailman in GNU Mailman before 2.1.31 allows Arbitrary Content Injection.
lists.opensuse.org/opensuse-security-announce/2020-05/msg00036.html
lists.opensuse.org/opensuse-security-announce/2020-06/msg00003.html
lists.opensuse.org/opensuse-security-announce/2020-10/msg00047.html
lists.opensuse.org/opensuse-security-announce/2020-10/msg00063.html
bugs.launchpad.net/mailman/+bug/1873722
code.launchpad.net/mailman
lists.debian.org/debian-lts-announce/2020/05/msg00007.html
lists.debian.org/debian-lts-announce/2020/07/msg00007.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/74EQIVFB34Q4UYAQLCUWG55YLKAUWCHD/
mail.python.org/pipermail/mailman-announce/
usn.ubuntu.com/4354-1/
www.debian.org/security/2021/dsa-4991