CVE-2019-9790: Mozilla Firefox

Critical severity, CVSS 9.8. EPSS: 1.9% chance of exploitation in the next 30 days.

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.

Affected products

• Mozilla Firefox: up to and including 60.6; up to and including 66.0
• Mozilla Thunderbird: up to and including 60.6

Published 2019-04-26. Last modified 2026-06-17.