CVE-2026-16383
Received Received - Intake

DOM Networking Component Mitigation Bypass in Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-21

Assigner: Mozilla Corporation

Description
Mitigation bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

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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-2026-16383
EUVD
EUVD-2026-46220

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 153 (inc)
mozilla firefox_esr to 140.13 (inc)
mozilla firefox 153
mozilla firefox_esr 140.13

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 vulnerability is a mitigation bypass in Firefox's DOM: Networking component. It allows attackers to bypass security measures that were meant to prevent certain types of attacks. The issue was addressed in Firefox version 153 and Firefox ESR version 140.13.

Detection Guidance

Detection requires checking Firefox version. Run 'firefox --version' or check 'about:support' in Firefox. Versions below 153 or Firefox ESR below 140.13 are vulnerable.

Impact Analysis

If exploited, this vulnerability could allow attackers to bypass security restrictions, potentially leading to unauthorized access to sensitive data or execution of malicious code on your system. Users of affected Firefox versions should update immediately.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions a mitigation bypass in the DOM: Networking component fixed in Firefox 153 and Firefox ESR 140.13.

Mitigation Strategies

Update Firefox to version 153 or later and Firefox ESR to 140.13 or later. Disable automatic updates temporarily if needed until patches are applied.

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