CVE-2026-81267
Received Received - Intake

Firefox for iOS Popup Navigation Spoofing Vulnerability

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: Mozilla Corporation

Description
A malicious webpage could stall a popup's cross-origin navigation after commit, causing the address bar to display the destination origin while continuing to render attacker-controlled content. This vulnerability was fixed in Firefox for iOS 155.0.

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Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-09-01
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
CVE-2026-81267
EUVD
EUVD-2026-68739

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox 155.0
mozilla firefox_for_ios 155.0

Helpful Resources

Exploitability

CWE
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KEV
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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.

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Executive Summary

This vulnerability allows a malicious webpage to stall a popup's cross-origin navigation after it has been committed. This causes the browser's address bar to show the destination website's origin while still displaying attacker-controlled content.

Detection Guidance

This vulnerability is specific to Firefox for iOS version 155.0 and involves malicious webpages manipulating popup navigation. Detection requires checking the installed version of Firefox for iOS. If you are not using Firefox for iOS or are using a version other than 155.0, the system is not affected. Use the App Store to verify the installed version of Firefox for iOS.

Impact Analysis

An attacker could trick you into thinking you are on a legitimate website while actually viewing malicious content. This could lead to phishing attacks, credential theft, or exposure to harmful software.

Compliance Impact

This vulnerability could potentially lead to phishing attacks by displaying a legitimate URL in the address bar while showing attacker-controlled content. This may undermine user trust and data integrity, which are critical for compliance with GDPR and HIPAA. However, the specific impact on compliance depends on how the vulnerability is exploited in practice.

Mitigation Strategies

Update Firefox for iOS to version 155.0 or later immediately. If you cannot update, avoid using Firefox for iOS until the update is applied. Disable popups in Firefox for iOS settings as a temporary measure.

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