---
id: CVE-2025-6426
title: >-
  The executable file warning did not warn users before opening files with the
  `terminal` extension
summary: >-
  The executable file warning did not warn users before opening files with the
  `terminal` extension. 

  *This bug only affects Firefox for macOS. Other versions of Firefox are
  unaffected.*. This vulnerability was fixed in Firefox 140, Firefo…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-345
vendor: mozilla
product: firefox
affected:
  - firefox < 128.12.0
  - 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-2025-6426'
references:
  - url: 'https://bugzilla.mozilla.org/show_bug.cgi?id=1964385'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-51/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-53/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-54/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-55/'
    label: security@mozilla.org
tags:
  - nvd
epss: 0.00205
epssPercentile: 0.09416
ingestedAt: '2026-09-30T18:17:24.443Z'
---

## Overview

The executable file warning did not warn users before opening files with the `terminal` extension. 
*This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

## Affected

- `firefox < 128.12.0`
- `firefox < 140.0`

## Remediation

Upgrade past the affected range:

- `firefox 140.0`