---
id: CVE-2025-9183
title: Spoofing issue in the Address Bar component
summary: >-
  Spoofing issue in the Address Bar component. This vulnerability was fixed in
  Firefox 142 and Firefox ESR 140.2.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'
cwe:
  - CWE-451
vendor: mozilla
product: firefox
affected:
  - firefox < 140.2.0
  - firefox < 142.0
patched:
  - firefox 142.0
published: '2025-08-19'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-9183'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1976102'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-64/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-67/'
    label: security@mozilla.org
tags:
  - nvd
epss: 0.0026
epssPercentile: 0.1598
ingestedAt: '2026-09-30T18:17:24.457Z'
---

## Overview

Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 142 and Firefox ESR 140.2.

## Affected

- `firefox < 140.2.0`
- `firefox < 142.0`

## Remediation

Upgrade past the affected range:

- `firefox 142.0`