CVE-2026-16371

Modified Modified - Updated After Analysis

Privilege Escalation in Firefox DOM Navigation

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description

Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-21

Last Modified

2026-07-24

Generated

2026-08-10

AI Q&A

2026-07-21

EPSS Evaluated

2026-08-09

NVD

CVE-2026-16371

EUVD

EUVD-2026-46207

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.0.0 (exc)
mozilla	firefox	to 140.13.0 (exc)
mozilla	thunderbird	to 140.13.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-269	The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

Executive Summary

This is a privilege escalation vulnerability in the DOM Navigation component of Firefox. It allows an attacker to gain higher privileges than intended, potentially leading to unauthorized access or control. The issue was fixed in Firefox version 153 and Firefox ESR version 140.13.

Detection Guidance

This vulnerability affects Firefox versions before 153 and Firefox ESR versions before 140.13. To detect it, check your installed Firefox version using commands like 'firefox --version' or 'apt list --installed | grep firefox' on Linux. Compare the version against the fixed releases.

Impact Analysis

If exploited, this vulnerability could allow an attacker to escalate their privileges on your system, potentially gaining access to sensitive data or performing unauthorized actions. Users of affected Firefox versions should update immediately to mitigate the risk.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. Without additional context on data exposure or processing implications, its effect on compliance cannot be determined.

Mitigation Strategies

Update Firefox to version 153 or later and Firefox ESR to version 140.13 or later to address the privilege escalation vulnerability in the DOM Navigation component.

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