A thunderbird security update has been released for Debian GNU/Linux 10.

DSA 4842-1: thunderbird security update

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Debian Security Advisory DSA-4842-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
January 31, 2021   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-15685 CVE-2020-16044 CVE-2020-26976 CVE-2021-23953
CVE-2021-23954 CVE-2021-23960 CVE-2021-23964

Multiple security issues have been found in Thunderbird, which may lead
to the execution of arbitrary code, denial of service or an information
leak.

For the stable distribution (buster), these problems have been fixed in
version 1:78.7.0-1~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/