---
id: CVE-2026-103417
title: >-
  Firefox for iOS could autofill saved credentials into a new page if
  cross-origin navigation occurred while the saved-login UI was open
summary: >-
  Firefox for iOS could autofill saved credentials into a new page if
  cross-origin navigation occurred while the saved-login UI was open. Autofill
  was not bound to the originating page or rejected when its origin changed.
  This vulnerabilit…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-346
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T13:17:13.330'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103417'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=2068171'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2026-105/'
    label: security@mozilla.org
tags:
  - nvd
ingestedAt: '2026-10-13T08:19:03.891Z'
---

## Overview

Firefox for iOS could autofill saved credentials into a new page if cross-origin navigation occurred while the saved-login UI was open. Autofill was not bound to the originating page or rejected when its origin changed. This vulnerability was fixed in Firefox for iOS 157.1.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.