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

DSA 4754-1: thunderbird security update

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Debian Security Advisory DSA-4754-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
August 29, 2020   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2020-15664 CVE-2020-15669

Multiple security issues have been found in Thunderbird which could
result in the execution of arbitrary code or the unintended installation
of extensions.

For the stable distribution (buster), these problems have been fixed in
version 1:68.12.0-1~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/