Several security issues were fixed in Thunderbird.
- thunderbird: Mozilla Open Source mail and newsgroup client
Multiple security issues were discovered in Thunderbird. If a user were
tricked in to opening a specially crafted website in a browsing context,
an attacker could potentially exploit these to cause a denial of service,
or execute arbitrary code. (CVE-2018-5125, CVE-2018-5127, CVE-2018-5129,
CVE-2018-5144, CVE-2018-5145, CVE-2018-5146)
The problem can be corrected by updating your system to the following