A thunderbird security update has been released for both Debian GNU/Linux 9 and 10 to address multiple security issues.

DSA 4718-1: thunderbird security update

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Debian Security Advisory DSA-4718-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
July 05, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-12417 CVE-2020-12418 CVE-2020-12419
CVE-2020-12420 CVE-2020-12421

Multiple security issues have been found in Thunderbird which could
result in denial of service or potentially the execution of arbitrary
code.

For the oldstable distribution (stretch), these problems have been fixed
in version 1:68.10.0-1~deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1:68.10.0-1~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/