CVE-2025-6426

HIGH

Mozilla Firefox < 128.12.0 - Data Authenticity Bypass

Title source: rule

Description

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.

References (5)

[Permissions Required] https://bugzilla.mozilla.org/show_bug.cgi?id=1964385

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-51/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-53/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-54/

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-55/

Scores

CVSS v3 8.8

EPSS 0.0014

EPSS Percentile 33.3%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-345

Status published

Products (6)

mozilla/firefox < 128.12.0

mozilla/firefox < 140.0

Mozilla/Firefox 128.12 - 128.*

Mozilla/Firefox 140

Mozilla/Thunderbird 128.12 - 128.*

Mozilla/Thunderbird 140

Published Jun 24, 2025

Tracked Since Feb 18, 2026