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CVE-2026-13356

Medium

Description

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.

SeverityMedium
CVSS6.3
Exploit probability—
ProductMozilla Firefox
PublishedJul 7, 2026
First seenJul 7, 2026
Weakness typeCWE-451CWE-451

How to fix

Update
  • mozilla firefox152.3 or later

Affected products

ProductAffected versionsFixed in
mozilla firefoxv < 152.3152.3

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