What’s Vulnerable › Vulnerabilities

CVE-2022-1529

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 17.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-22 · updated 2026-06-17
• Weakness: CWE-1321

Description

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; before 100.3.0 — fixed in 100.0.2, 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

How to fix

Upgrade to a fixed version: Mozilla Firefox 100.0.2, 100.3.0; Mozilla Firefox ESR 91.9.1; Mozilla Thunderbird 91.9.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1770048
• https://www.mozilla.org/security/advisories/mfsa2022-19/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1770048
• https://www.mozilla.org/security/advisories/mfsa2022-19/

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