Language Pack Sandbox Escape: Exploiting Firefox ESR and Thunderbird Vulnerability

CVE-2019-9811 · HIGH Severity

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

As part of a winning Pwn2Own entry, a researcher demonstrated a sandbox escape by installing a malicious language pack and then opening a browser feature that used the compromised translation. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

Learn more about our Web Application Penetration Testing UK.