A thunderbird security update has been released for Debian GNU/Linux 11 to address multiple security issues.

DSA 5238-1: thunderbird security update

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Debian Security Advisory DSA-5238-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
September 27, 2022   https://www.debian.org/security/faq
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Package : thunderbird
CVE ID : CVE-2022-40956 CVE-2022-40957 CVE-2022-40958 CVE-2022-40959
CVE-2022-40960 CVE-2022-40962

Multiple security issues were discovered in Thunderbird, which could
result in denial of service or the execution of arbitrary code.

For the stable distribution (bullseye), these problems have been fixed in
version 1:102.3.0-1~deb11u1. Debian follows the Thunderbird upstream
releases. Support for the 91.x series has ended, so starting with this
update we're now following the 102.x series.

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/