A redmine security update has been released for Debian GNU/Linux 9 LTS to address an information leak.

DLA 2787-1: redmine security update

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Debian LTS Advisory DLA-2787-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
October 18, 2021   https://wiki.debian.org/LTS
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Package : redmine
Version : 3.3.1-4+deb9u5
CVE ID : CVE-2021-42326

Redmine, a project management web application, may disclose the names
of users on activity views due to an insufficient access filter. An
attacker may infer information of users working on private projects.

For Debian 9 stretch, this problem has been fixed in version
3.3.1-4+deb9u5.

We recommend that you upgrade your redmine packages.

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

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