SEPTEMBER 15, 2026
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Case File

CVE-2026-84129

CRITICAL · CVSS 9.8 EPSS 0.18%

Source: NVD + CISA KEV + EPSS · Published 2026-09-01 · Last synced 2026-09-15

CyberRota Analysis

AI-Generated

A site isolation vulnerability in the DOM navigation component of Firefox could potentially allow attackers to exploit the browser's handling of web content, leading to unauthorized access to sensitive data across different sites. Users and organizations relying on Firefox for secure browsing should prioritize updating to Firefox version 155 or Firefox ESR 153.2 to mitigate this risk.

CVE
CVE-2026-84129
Severity
CRITICAL
CVSS
9.8
EPSS
0.18%
Firefox

Original NVD Description

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, 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