CVE-2019-9811

Mozilla: Sandbox escape via installation of malicious language pack

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.0

Review impact separately from score.

Published · July 10, 2019

Updated · November 22, 2025

Description

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.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 7.5
CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-807 · Reliance on Untrusted Inputs in a Security Decision