CVE-2022-28282: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 2.1% chance of exploitation in the next 30 days.

By using a link with <code>rel="localization"</code> a use-after-free could have been triggered by destroying an object during JavaScript execution and then referencing the object through a freed pointer, leading to a potential exploitable crash. This vulnerability affects Thunderbird < 91.8, Firefox < 99, and Firefox ESR < 91.8.

Affected products

• Mozilla Firefox: before 99.0 (fixed in 99.0)
• Mozilla Firefox ESR: before 91.8 (fixed in 91.8)
• Mozilla Thunderbird: before 91.8 (fixed in 91.8)

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