A libphp-phpmailer security update has been released for Debian GNU/Linux 9 LTS to address an escaping issue in libphp-phpmailer.

DLA 2306-1: libphp-phpmailer security update

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Debian LTS Advisory DLA-2306-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Abhijith PA
August 01, 2020   https://wiki.debian.org/LTS
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Package : libphp-phpmailer
Version : 5.2.14+dfsg-2.3+deb9u2
CVE ID : CVE-2020-13625
Debian Bug : 962827

It was discovered that there was an escaping issue in
libphp-phpmailer, an email generation utility class for the PHP
programming language.

The `Content-Type` and `Content-Disposition` headers could have
permitted file attachments that bypassed attachment filters which
match on filename extensions.

For Debian 9 stretch, this problem has been fixed in version
5.2.14+dfsg-2.3+deb9u2.

We recommend that you upgrade your libphp-phpmailer packages.

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

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