CVE-2021-43528
Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack with other vulnerabilities. This vulnerability affects Thunderbird < 91.4.0. Date published : 2021-12-08 https://bugzilla.mozilla.org/show_bug.cgi?id=1742579