Gerade kam über die Mailingliste folgendes rein
Multiple security issues were discovered in Thunderbird, which could
result in the execution of arbitrary code or information disclosure.For the oldstable distribution (buster), these problems have been fixed
in version 1:91.7.0-2~deb10u1.For the stable distribution (bullseye), these problems have been fixed in
version 1:91.7.0-2~deb11u1.
Das mal direkt getestet.
91.6.2 vor dem Update, danach 91.7.0 Zum Vergleich, auf meiner normalen Linux Mint 20.3 Cinnamon Installation ist Version 91.5.0 enthalten.