Ubuntu Security Notice USN-782-1 – Several flaws were discovered in the JavaScript engine of Thunderbird. Several flaws were discovered in the way Thunderbird processed malformed URI schemes. Cefn Hoile discovered Thunderbird did not adequately protect against embedded third-party stylesheets. Shuo Chen, Ziqing Mao, Yi-Min Wang, and Ming Zhang discovered that Thunderbird did not properly handle error responses when connecting to a proxy server. It was discovered that Thunderbird could be made to run scripts with elevated privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/78673/USN-782-1.txt
Source: https://packetstormsecurity.com/files/78673/Ubuntu-Security-Notice-782-1.html