CVE-2022-22741: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

When resizing a popup while requesting fullscreen access, the popup would have become unable to leave fullscreen mode. This vulnerability affects Firefox ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

Affected products

• Mozilla Firefox: before 96.0 (fixed in 96.0)
• Mozilla Firefox ESR: before 91.5 (fixed in 91.5)
• Mozilla Thunderbird: before 91.5 (fixed in 91.5)

Published 2022-12-22. Last modified 2026-06-17.