CVE-2022-1802

HIGH EXPLOITED IN THE WILD

Firefox < 100.0.2, Firefox ESR < 91.9.1, Thunderbird < 91.9.1 - Privileged JavaScript Execution via Prototype Pollution

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2022-1802 has been observed exploited in the wild (reported by VulnCheck KEV, InTheWild.io). EIP tracks 1 public exploit from researchers including mistymntncop.

AI-analyzed exploit summary This is a working exploit PoC for CVE-2022-1802, targeting a type confusion vulnerability in Firefox 100.0.1. It leverages memory corruption to achieve arbitrary read/write primitives, enabling potential RCE.

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.

Exploits (1)

nomisec WORKING POC 152 stars
by mistymntncop · client-side
https://github.com/mistymntncop/CVE-2022-1802

This is a working exploit PoC for CVE-2022-1802, targeting a type confusion vulnerability in Firefox 100.0.1. It leverages memory corruption to achieve arbitrary read/write primitives, enabling potential RCE.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Complex
Reliability
Reliable
Target: Mozilla Firefox 100.0.1 (Windows)
No auth needed
Prerequisites: Target running Firefox 100.0.1 on Windows · Ability to execute JavaScript in the target browser
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Issue Tracking, Permissions Required, Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1770137

Scores

CVSS v3 8.8
EPSS 0.2671
EPSS Percentile 97.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact total

Details

VulnCheck KEV 2022-08-15
InTheWild.io 2022-08-15
CWE
CWE-1321
Status published
Products (3)
mozilla/firefox < 100.0.2
mozilla/firefox_esr < 91.9.1
mozilla/thunderbird < 91.9.1
Published Dec 22, 2022
Tracked Since Feb 18, 2026