CVE-2022-29911: Mozilla Firefox

Medium severity, CVSS 6.1. EPSS: 0.6% chance of exploitation in the next 30 days.

An improper implementation of the new iframe sandbox keyword <code>allow-top-navigation-by-user-activation</code> could lead to script execution without <code>allow-scripts</code> being present. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.

Affected products

• Mozilla Firefox: before 100.0 (fixed in 100.0)
• Mozilla Firefox ESR: before 91.9 (fixed in 91.9)
• Mozilla Thunderbird: before 91.9 (fixed in 91.9)

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