What’s Vulnerable › Vulnerabilities

CVE-2022-1802

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 28.5% 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

If an attacker was able to corrupt the methods of an Array object in JavaScript via prototype pollution, they could have achieved execution of attacker-controlled JavaScript code in a privileged context. 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=1770137
• https://www.mozilla.org/security/advisories/mfsa2022-19/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1770137
• https://www.mozilla.org/security/advisories/mfsa2022-19/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1770137

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