Secunia Security Advisory – Ubuntu has issued an update for mozilla-thunderbird. This fixes some vulnerabilities, which can be exploited by malicious people to bypass certain security restrictions, conduct cross-site scripting and HTTP response smuggling attacks, and potentially compromise a user’s system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/48595/sa21210.txt
Source: https://packetstormsecurity.com/files/48595/Secunia-Security-Advisory-21210.html