A thunderbird security update has been released for both Debian GNU/Linux 9 and 10 to address multiple security issues, which could result in spoofing the displayed sender email address, denial of service or potentially the execution of arbitrary code.

DSA 4683-1: thunderbird security update

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Debian Security Advisory DSA-4683-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 08, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-6831 CVE-2020-12387 CVE-2020-12392 CVE-2020-12395
CVE-2020-12397

Multiple security issues have been found in Thunderbird which could
result in spoofing the displayed sender email address, denial of service
or potentially the execution of arbitrary code.

For the oldstable distribution (stretch), these problems have been fixed
in version 1:68.8.0-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1:68.8.0-1~deb10u1.

We recommend that you upgrade your thunderbird packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/