Secunia Security Advisory – Ubuntu has issued an update for thunderbird. This fixes some vulnerabilities, which can be exploited by malicious people to conduct cross-site scripting attacks and compromise a user’s system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/48692/sa21275.txt
Source: https://packetstormsecurity.com/files/48692/Secunia-Security-Advisory-21275.html