CVE-2026-16400

Undergoing Analysis Undergoing Analysis - In Progress

DOM Information Disclosure in Mozilla Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description

Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

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-2026-16400

EUVD

EUVD-2026-46238

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	to 153.0 (exc)
mozilla	firefox	to 153.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-200	The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

Executive Summary

This is an information disclosure vulnerability in the DOM Security component of Firefox. It was patched in Firefox version 153. The issue allows unauthorized access to sensitive data through the Document Object Model.

Detection Guidance

This vulnerability is specific to Firefox versions before 153. Detection involves checking the installed Firefox version. On Linux or macOS, run: firefox --version. On Windows, check the Firefox installation directory or use the About Firefox page in the application. If the version is below 153, the system is vulnerable.

Impact Analysis

An attacker could exploit this to access private information stored in the browser or displayed on web pages. This may lead to data theft, account hijacking, or exposure of sensitive user data.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions an information disclosure issue in Firefox's DOM security component, fixed in version 153.

Mitigation Strategies

Update Firefox to version 153 or later to address the information disclosure vulnerability in the DOM Security component.

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