A zabbix security update has been released for Debian GNU/Linux 9 LTS to address a potential cross-site scripting vulnerability via iframe HTML elements.

DLA 2311-1: zabbix security update

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Debian LTS Advisory DLA-2311-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
August 3, 2020   https://wiki.debian.org/LTS
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Package : zabbix
Version : 1:3.0.7+dfsg-3+deb9u1
CVE ID : CVE-2020-15803
Debian Bug : #966146

It was discovered that there was a potential cross-site scripting
vulnerability via iframe HTML elements in Zabbix, a PHP-based
monitoring system.

For Debian 9 "Stretch", this problem has been fixed in version
1:3.0.7+dfsg-3+deb9u1.

We recommend that you upgrade your zabbix packages.

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

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