GNU Mailman before version 2.1.27 has a cross-site scripting flaw that allows malicious listowners to inject scripts into listinfo pages.
Created mailman tracking bugs for this issue:
Affects: fedora-all [bug 1596459]
Upstream commits referencing JVN#00846677:
A malicious list owners can inject scripts into the /mailman/listinfo page of a specially crafted list, due to not validated input in host_name field.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7
Via RHSA-2020:1054 https://access.redhat.com/errata/RHSA-2020:1054
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):