A mailman security update has been released for Debian GNU/Linux 9 LTSto address two security issues.

DLA 2276-1: mailman security update

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Debian LTS Advisory DLA-2276-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
July 10, 2020   https://wiki.debian.org/LTS
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Package : mailman
Version : 1:2.1.23-1+deb9u6
CVE ID : CVE-2020-12108 CVE-2020-15011

The following CVEs were reported against src:mailman.

CVE-2020-12108

/options/mailman in GNU Mailman before 2.1.31 allows Arbitrary
Content Injection.

CVE-2020-15011

GNU Mailman before 2.1.33 allows arbitrary content injection via
the Cgi/private.py private archive login page.

For Debian 9 stretch, these problems have been fixed in version
1:2.1.23-1+deb9u6.

We recommend that you upgrade your mailman packages.

For the detailed security status of mailman please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/mailman

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