Secunia Security Advisory – Ubuntu has issued an update for mozilla-thunderbird. This fixes some vulnerabilities, which can be exploited by malicious people to conduct man-in-the-middle attacks, bypass certain security restrictions, and potentially compromise a vulnerable system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/50255/sa22074.txt
Source: https://packetstormsecurity.com/files/50255/Secunia-Security-Advisory-22074.html