A php-horde security update has been released for Debian GNU/Linux 9 LTS.

DLA 2349-1: php-horde security update

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Debian LTS Advisory DLA-2349-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Mike Gabriel
August 29, 2020   https://wiki.debian.org/LTS
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Package : php-horde
Version : 5.2.13+debian0-1+deb9u3
CVE ID : CVE-2017-16907
Debian Bug : 909739

In Horde Groupware, there has been an XSS vulnerability in two components
via the Color field in a Create Task List action.

For Debian 9 stretch, this problem has been fixed in version
5.2.13+debian0-1+deb9u3.

We recommend that you upgrade your php-horde packages.

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

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