Mozilla Thunderbird is a standalone mail and newsgroup client.
This update upgrades Thunderbird to version 68.9.0.
Mozilla: Security downgrade with IMAP STARTTLS leads to information leakage (CVE-2020-12398)
Mozilla: Use-after-free in SharedWorkerService (CVE-2020-12405)
Mozilla: Memory safety bugs fixed in Firefox 77 and Firefox ESR 68.9 (CVE-2020-12410)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.