CVE-2026-16403

Undergoing Analysis Undergoing Analysis - In Progress

Address Bar Spoofing in Firefox

Publication date: 2026-07-21

Last updated on: 2026-07-24

Assigner: Mozilla Corporation

Description

Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVSS Scores

EPSS Scores

Probability:
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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-2026-16403

EUVD

EUVD-2026-46241

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-451	The user interface (UI) does not properly represent critical information to the user, allowing the information - or its source - to be obscured or spoofed. This is often a component in phishing attacks.

Attack-Flow Graph

Executive Summary

This is a spoofing issue in Firefox's Address Bar component. It allows an attacker to trick users into believing they are on a legitimate website when they are actually on a malicious one. The vulnerability was patched in Firefox version 153.

Detection Guidance

Detection methods for this vulnerability are not specified in the provided CVE data. Since this is a spoofing issue in Firefox's Address Bar component fixed in version 153, you may check your Firefox version with commands like 'firefox --version' or 'about:support' in the browser. If your version is below 153, the system is vulnerable.

Impact Analysis

This vulnerability could lead to phishing attacks where users unknowingly enter sensitive information like passwords or credit card details on fake websites. It may also enable malware downloads or other malicious activities by deceiving users.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The description only mentions a spoofing issue in Firefox's Address Bar component, fixed in Firefox 153.

Mitigation Strategies

Update Firefox to version 153 or later to address the spoofing issue in the Address Bar component.

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