Debian 10-11: DSA-5034-1 Critical: Thunderbird Code Execution Risk

Multiple security issues were discovered in Thunderbird, which could
result in the execution of arbitrary code, spoofing, information disclosure,
downgrade attacks on SMTP STARTTLS connections or misleading display of
OpenPGP/MIME signatures.

For the oldstable distribution (buster), these problems have been fixed
in version 1:91.4.1-1~deb10u1.

For the stable distribution (bullseye), these problems have been fixed in
version 1:91.4.1-1~deb11u1.

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/source-package/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/