CVE-2018-12368

Windows 10 does not warn users before opening executable files with the
SettingContent-ms extension even when they have been downloaded from the
internet and have the “Mark of the Web.” Without the warning, unsuspecting
users unfamiliar with this new file type might run an unwanted executable.
This also allows a WebExtension with the limited downloads.open permission
to execute arbitrary code without user interaction on Windows 10 systems.
Note: this issue only affects Windows operating systems. Other operating
systems are unaffected.. This vulnerability affects Thunderbird < 60,
Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox <
61.

Notes