CVE-2020-15646
If an attacker intercepts Thunderbird’s initial attempt to perform automatic account setup using the Microsoft Exchange autodiscovery mechanism, and the attacker sends a crafted response, then Thunderbird sends username and password over https to a server controlled by the attacker. This vulnerability affects Thunderbird < 68.10.0. Date published : 2020-10-08 https://bugzilla.mozilla.org/show_bug.cgi?id=1606610