A wordpress security update has been released for Debian GNU/Linux 9 LTS to address an object injection in PHPMailer.

DLA 2731-1: wordpress security update

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Debian LTS Advisory DLA-2731-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
August 04, 2021   https://wiki.debian.org/LTS
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Package : wordpress
Version : 4.7.21+dfsg-0+deb9u1
CVE ID : not assigned yet

One security issue affects WordPress, a weblog manager, versions
between 3.7 and 5.7. This update fixes the following security issues:
Object injection in PHPMailer (CVE-2020-36326 and CVE-2018-19296).

For Debian 9 stretch, this problem has been fixed in version
4.7.21+dfsg-0+deb9u1.

We recommend that you upgrade your wordpress packages.

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

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