---
id: CVE-2025-6428
title: >-
  When a URL was provided in a link querystring parameter, Firefox for Android
  would follow that URL instead of the correct URL, potentially leading to
  phishing attacks.

  *This bug only affects Firefox for Android
summary: >-
  When a URL was provided in a link querystring parameter, Firefox for Android
  would follow that URL instead of the correct URL, potentially leading to
  phishing attacks.

  *This bug only affects Firefox for Android. Other versions of Firefox…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-601
vendor: mozilla
product: firefox
affected:
  - firefox < 140.0
patched:
  - firefox 140.0
published: '2025-06-24'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-6428'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1970151'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-51/'
    label: security@mozilla.org
tags:
  - nvd
epss: 0.00227
epssPercentile: 0.12127
ingestedAt: '2026-09-30T18:17:24.443Z'
---

## Overview

When a URL was provided in a link querystring parameter, Firefox for Android would follow that URL instead of the correct URL, potentially leading to phishing attacks.
*This bug only affects Firefox for Android. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140.

## Affected

- `firefox < 140.0`

## Remediation

Upgrade past the affected range:

- `firefox 140.0`