Ubuntu Security Notice 6669-1 - Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, bypass security restrictions, cross-site tracing, or execute arbitrary code.
63ee0e6f83b4e9f77d873f79cf50c1f02a046461e6ad8e93392c9da32d118bfc