CVE-2026-16399
Received Received - Intake

Firefox DOM Navigation Site Isolation Flaw

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Mozilla Corporation

Description
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153.

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Meta Information

Published
2026-07-21
Last Modified
2026-07-21
Generated
2026-07-21
AI Q&A
2026-07-21
EPSS Evaluated
N/A
NVD
CVE-2026-16399
EUVD
EUVD-2026-46237

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
mozilla firefox 153

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 Firefox's DOM Navigation component. It allows potential unauthorized access between different sites due to improper isolation of navigation actions.

Impact Analysis

An attacker could exploit this to access data or perform actions on one site while you are logged into another site, potentially stealing sensitive information or hijacking sessions.

Mitigation Strategies

Update Firefox to version 153 or later to address the site isolation issue in the DOM Navigation component.

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