CVE-2026-117959
Received Received - Intake

DOM Service Worker Site Isolation Issue in Firefox

Publication date: 2026-10-27

Last updated on: 2026-10-27

Assigner: Mozilla Corporation

Description
Site isolation issue in the DOM: Service Workers component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.

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Meta Information

Published
2026-10-27
Last Modified
2026-10-27
Generated
2026-10-27
AI Q&A
2026-10-27
EPSS Evaluated
N/A
NVD
CVE-2026-117959
EUVD
EUVD-2026-110990

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a site isolation issue in the DOM: Service Workers component of Firefox. It was addressed in Firefox 159 and Firefox ESR 153.6.

Impact Analysis

The vulnerability could allow unauthorized access to data between different sites due to improper isolation in the browser.

Mitigation Strategies

Update Firefox to version 159 or later and Firefox ESR to version 153.6 or later to address the DOM: Service Workers site isolation issue.

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