CVE-2019-11694: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

A vulnerability exists in the Windows sandbox where an uninitialized value in memory can be leaked to a renderer from a broker when making a call to access an otherwise unavailable file. This results in the potential leaking of information stored at that memory location. *Note: this issue only occurs on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

Affected products

• Mozilla Firefox: before 60.7.0 (fixed in 60.7.0); before 67.0 (fixed in 67.0)
• Mozilla Thunderbird: before 60.7.0 (fixed in 60.7.0)

Published 2019-07-23. Last modified 2026-06-17.