OCTOBER 8, 2026
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Case File

CVE-2026-100831

HIGH · CVSS 8.8 EPSS 0.25%

Source: NVD + CISA KEV + EPSS · Published 2026-09-29 · Last synced 2026-10-08

CyberRota Analysis

AI-Generated

A use-after-free vulnerability in the DOM: UI Events & Focus Handling component of Firefox can lead to arbitrary code execution, potentially allowing attackers to exploit the flaw for malicious purposes. Users of affected Firefox versions, particularly those in enterprise environments relying on Firefox ESR, should prioritize updating to versions 153.4 or 157 to mitigate this high-severity risk.

CVE
CVE-2026-100831
Severity
HIGH
CVSS
8.8
EPSS
0.25%
Firefox

Original NVD Description

Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.