CVE-2022-26384: Mozilla Firefox

Critical severity, CVSS 9.6. EPSS: 1% chance of exploitation in the next 30 days.

If an attacker could control the contents of an iframe sandboxed with <code>allow-popups</code> but not <code>allow-scripts</code>, they were able to craft a link that, when clicked, would lead to JavaScript execution in violation of the sandbox. This vulnerability affects Firefox < 98, Firefox ESR < 91.7, and Thunderbird < 91.7.

Affected products

• Mozilla Firefox: before 98.0 (fixed in 98.0)
• Mozilla Firefox ESR: before 91.7 (fixed in 91.7)
• Mozilla Thunderbird: before 91.7 (fixed in 91.7)

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