CVE-2026-2634

Received Received - Intake

Address Bar Desynchronization in Firefox iOS Enables URL Spoofing

Publication date: 2026-02-24

Last updated on: 2026-04-13

Assigner: Mozilla Corporation

Description

Malicious scripts could cause desynchronization between the address bar and web content before a response is received in Firefox iOS, allowing attacker-controlled pages to be presented under spoofed domains. This vulnerability was fixed in Firefox for iOS 147.4.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-02-24

Last Modified

2026-04-13

Generated

2026-07-06

AI Q&A

2026-02-24

EPSS Evaluated

2026-07-05

NVD

CVE-2026-2634

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 147.4 (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 vulnerability in Firefox for iOS versions before 147.4 involves malicious scripts causing a desynchronization between the address bar and the web content before a response is fully received.

As a result, attacker-controlled pages can be displayed under spoofed, trusted domain names, misleading users about the actual website they are visiting.

Impact Analysis

This vulnerability can lead to users being shown spoofed web pages that appear to be from trusted domains, potentially tricking them into divulging sensitive information or performing unintended actions.

Such spoofing can facilitate phishing attacks, credential theft, or other malicious activities by exploiting the mismatch between the displayed URL and the actual content.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, you should update Firefox for iOS to version 147.4 or later, where the issue has been fixed.

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