Firefox iOS 152.3 - UI Address Bar Leak via Sync JS Dialog
CVE-2026-13356 Published on July 6, 2026
Interrupted navigation could allow address bar origin spoofing in Firefox for iOS
A malicious webpage could interrupt a pending navigation by enqueuing a synchronous JavaScript dialog, causing the browser UI to display the destination origin in the address bar while continuing to render attacker-controlled content. This vulnerability was fixed in Firefox for iOS 152.3.
Vulnerability Analysis
CVE-2026-13356 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.
Weakness Type
User Interface (UI) Misrepresentation of Critical Information
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.
Products Associated with CVE-2026-13356
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Affected Versions
Mozilla Firefox for iOS:- Version 152.3, <= * is unaffected.