SEPTEMBER 17, 2026
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Case File

CVE-2026-84124

MEDIUM · CVSS 5.4 EPSS 0.17%

Source: NVD + CISA KEV + EPSS · Published 2026-09-01 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

A use-after-free vulnerability exists in the DOM Core and HTML components of Firefox, which could allow an attacker to execute arbitrary code or cause a crash. Users of affected Firefox versions should prioritize updating to Firefox 155, Firefox ESR 140.15, or Firefox ESR 153.2 to mitigate potential exploitation risks. This issue is particularly relevant for organizations relying on Firefox for secure web browsing.

CVE
CVE-2026-84124
Severity
MEDIUM
CVSS
5.4
EPSS
0.17%
Firefox

Original NVD Description

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Related CVEs

Other vulnerabilities affecting the same vendor(s)

CVE-2026-84642 HIGH CVE-2026-84641 HIGH CVE-2026-84640 HIGH CVE-2026-84639 CRITICAL CVE-2026-84637 CRITICAL CVE-2026-84145 HIGH