CVE-2019-9790: Mozilla: Use-after-free when removing in-use DOM elements

Severity: Critical

CVSS Score: 9.8

A use-after-free vulnerability can occur when a raw pointer to a DOM element on a page is obtained using JavaScript and the element is then removed while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.