SEPTEMBER 17, 2026
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Case File

CVE-2026-74956

CRITICAL · CVSS 9.1 EPSS 0.28%

Source: NVD + CISA KEV + EPSS · Published 2026-08-18 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

A same-origin policy bypass vulnerability in the Service Workers component of Firefox could allow attackers to access restricted resources across different origins. This flaw affects users of Firefox versions prior to 154 and Firefox ESR versions prior to 153.1, making it critical for organizations using these versions to prioritize updates to mitigate potential security risks.

CVE
CVE-2026-74956
Severity
CRITICAL
CVSS
9.1
EPSS
0.28%
Firefox

Original NVD Description

Same-origin policy bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

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