A thunderbird security update has been released for Debian GNU/Linux 8 LTS to address multiple security issues.

Package : thunderbird
Version : 1:68.4.1-1~deb8u1
CVE ID : CVE-2019-17016 CVE-2019-17017 CVE-2019-17022 CVE-2019-17024
CVE-2019-17026

Multiple security issues have been found in Thunderbird which could
potentially result in the execution of arbitrary code or information
disclosure.

For Debian 8 "Jessie", these problems have been fixed in version
1:68.4.1-1~deb8u1.

We recommend that you upgrade your thunderbird packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS