Given a compromised sandboxed content process due to a separate vulnerability, it is possible to escape that sandbox by loading accounts.firefox.com in that process and forcing a log-in to a malicious Firefox Sync account. Preference settings that disable the sandbox are then synchronized to the local machine and the compromised browser would restart without the sandbox if a crash is triggered. This vulnerability affects Firefox ESR < 60.9, Firefox ESR < 68.1, and Firefox < 69.

Related CVEs

CVE-2019-9812

Key Information

GHSA ID

GHSA-jh9w-r6qf-jxc5

Published

May 24, 2022 5:05 PM

Last Modified

October 21, 2024 3:32 PM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: November 24, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.