CVE-2026-16399 - Vulnerability Details - OpenCVE

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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00133.

Exploitation none

Automatable yes

Technical Impact partial

No data.

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References

Link	Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2049981
https://www.mozilla.org/security/advisories/mfsa2026-68/
https://www.mozilla.org/security/advisories/mfsa2026-71/

History

Wed, 22 Jul 2026 20:00:00 +0000

Type	Values Removed	Values Added
Description	Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153.	Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
References		https://www.mozilla.org/security/advisories/mfsa2026-71/

Wed, 22 Jul 2026 18:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-346
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}` ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Tue, 21 Jul 2026 12:45:00 +0000

Type	Values Removed	Values Added
Description		Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 153.
Title		Site isolation issue in the DOM: Navigation component
References		https://bugzilla.mozilla.org/show_bug.cgi?id=2049981 https://www.mozilla.org/security/advisories/mfsa2026-68/

MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2026-07-21T12:38:12.355Z

Updated: 2026-07-22T19:19:04.320Z

Reserved: 2026-07-20T21:57:29.336Z

Link: CVE-2026-16399

Vulnrichment

Updated: 2026-07-22T17:22:14.171Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

No data.

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