CVE-2022-1529: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 17.1% chance of exploitation in the next 30 days.

An attacker could have sent a message to the parent process where the contents were used to double-index into a JavaScript object, leading to prototype pollution and ultimately attacker-controlled JavaScript executing in the privileged parent process. This vulnerability affects Firefox ESR < 91.9.1, Firefox < 100.0.2, Firefox for Android < 100.3.0, and Thunderbird < 91.9.1.

Affected products

• Mozilla Firefox: before 100.0.2 (fixed in 100.0.2); before 100.3.0 (fixed in 100.3.0)
• Mozilla Firefox ESR: before 91.9.1 (fixed in 91.9.1)
• Mozilla Thunderbird: before 91.9.1 (fixed in 91.9.1)

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