SEPTEMBER 17, 2026
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Case File

CVE-2026-84120

MEDIUM · CVSS 5.4 EPSS 0.22%

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

CyberRota Analysis

AI-Generated

A use-after-free vulnerability in the Audio/Video component of Firefox could allow an attacker to execute arbitrary code, potentially leading to system compromise. Users of affected Firefox versions should prioritize updating to Firefox 155 or the specified ESR versions to mitigate this risk. Organizations relying on Firefox for web access, particularly those handling sensitive data, should address this vulnerability promptly.

CVE
CVE-2026-84120
Severity
MEDIUM
CVSS
5.4
EPSS
0.22%
Firefox

Original NVD Description

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, 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