CVE-2026-13356: Interrupted navigation could allow address bar origin spoofing in Firefox for iOS

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-07 · updated 2026-10-25
Weakness: CWE-451

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.

Affected products

Mozilla Firefox: before 152.3 — fixed in 152.3

How to fix

Upgrade to a fixed version: Mozilla Firefox 152.3. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2047768
https://www.mozilla.org/security/advisories/mfsa2026-65/

Get alerted when CVE-2026-13356 or the next vulnerability affects your stack