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Mozilla CVE-2025-6426

| EUVDEUVD-2025-19102 HIGH
Insufficient Verification of Data Authenticity (CWE-345)
2025-06-24 security@mozilla.org
Information Disclosure Mozilla Apple
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
qualitative
SUSE
HIGH
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 15, 2026 - 22:36 euvd
EUVD-2025-19102
Analysis Generated
Mar 15, 2026 - 22:36 vuln.today
CVE Published
Jun 24, 2025 - 13:15 nvd
HIGH 8.8

DescriptionCVE.org

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 affects Firefox < 140, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12.

AnalysisAI

CVE-2025-6426 is a missing executable file warning vulnerability in Firefox and Thunderbird on macOS that fails to alert users before opening files with the 'terminal' extension, potentially allowing attackers to execute arbitrary code. This affects Firefox < 140, Firefox ESR < 128.12, Thunderbird < 140, and Thunderbird < 128.12 on macOS only. An attacker can leverage this to trick users into executing malicious terminal scripts by bypassing the security warning mechanism that normally prevents automatic execution of executable files.

Technical ContextAI

The vulnerability stems from improper input validation and security control implementation in the file execution warning system (CWE-345: Insufficient Verification of Data Authenticity). Firefox and Thunderbird on macOS maintain a list of file extensions recognized as executable to trigger user warnings before opening them. The 'terminal' extension was omitted from this safelist, allowing .terminal files (macOS shell script bundles that execute commands) to bypass the executable file warning dialog. This is specific to macOS because .terminal files are a native macOS construct for executing shell scripts. The affected CPE ranges are: mozilla:firefox < 140.0, mozilla:firefox_esr < 128.12, mozilla:thunderbird < 140.0, and mozilla:thunderbird < 128.12. The root cause is incomplete enumeration of dangerous file types in the extension validation logic.

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Same weakness CWE-345 – Insufficient Verification of Data Authenticity

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9.3
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7.8
CVE-2025-66255 CRITICAL POC
9.9
CVE-2025-1945 CRITICAL POC
9.8
CVE-2024-11666 CRITICAL POC
9.8
CVE-2024-1554 CRITICAL POC
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Same technique Information Disclosure

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7.5
CVE-2014-6324 HIGH POC
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7.3

Vendor StatusVendor

Ubuntu

Priority: Medium
firefox
Release Status Version
jammy not-affected code not present
noble not-affected code not present
oracular not-affected code not present
plucky not-affected code not present
upstream not-affected debian: MacOS-specific
questing not-affected code not present
thunderbird
Release Status Version
noble not-affected code not present
oracular not-affected code not present
plucky not-affected code not present
jammy released 1:128.12.0+build1-0ubuntu0.22.04.1
upstream released 128.12
questing not-affected code not present
mozjs38
Release Status Version
bionic needs-triage -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs52
Release Status Version
bionic ignored -
focal ignored -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs68
Release Status Version
focal ignored -
jammy DNE -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs78
Release Status Version
jammy ignored -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs91
Release Status Version
jammy ignored -
noble DNE -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs102
Release Status Version
jammy ignored -
noble ignored -
oracular DNE -
plucky DNE -
upstream needs-triage -
questing DNE -
mozjs115
Release Status Version
jammy DNE -
noble ignored -
oracular ignored -
plucky ignored -
upstream needs-triage -
questing DNE -
USN-7663-1

Debian

firefox
Release Status Fixed Version Urgency
sid fixed 148.0.2-1 -
(unstable) not-affected - -
firefox-esr
Release Status Fixed Version Urgency
bullseye fixed 115.14.0esr-1~deb11u1 -
bullseye (security) fixed 140.8.0esr-1~deb11u1 -
bookworm fixed 128.14.0esr-1~deb12u1 -
bookworm (security) fixed 140.8.0esr-1~deb12u1 -
trixie (security), trixie fixed 140.8.0esr-1~deb13u1 -
forky, sid fixed 140.8.0esr-1 -
(unstable) not-affected - -
thunderbird
Release Status Fixed Version Urgency
bullseye fixed 1:115.12.0-1~deb11u1 -
bullseye (security) fixed 1:140.8.0esr-1~deb11u1 -
bookworm fixed 1:140.6.0esr-1~deb12u1 -
bookworm (security) fixed 1:140.8.0esr-1~deb12u1 -
trixie (security), trixie fixed 1:140.8.0esr-1~deb13u1 -
forky, sid fixed 1:140.8.0esr-1 -
(unstable) not-affected - -

SUSE

Severity: High
Product Status
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-4.11 Affected
Image SLES12-SP5-SAP-Azure-LI-BYOS-Production Image SLES12-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP4-SAP-Azure-LI-BYOS Image SLES15-SP4-SAP-Azure-LI-BYOS-Production Image SLES15-SP4-SAP-Azure-VLI-BYOS Image SLES15-SP4-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP5-SAP-Azure-LI-BYOS Image SLES15-SP5-SAP-Azure-LI-BYOS-Production Image SLES15-SP5-SAP-Azure-VLI-BYOS Image SLES15-SP5-SAP-Azure-VLI-BYOS-Production Affected
Image SLES15-SP6-SAP-Azure-LI-BYOS Image SLES15-SP6-SAP-Azure-LI-BYOS-Production Image SLES15-SP6-SAP-Azure-VLI-BYOS Image SLES15-SP6-SAP-Azure-VLI-BYOS-Production Image SLES15-SP7-SAP-Azure-LI-BYOS-Production Image SLES15-SP7-SAP-Azure-VLI-BYOS-Production Affected

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CVE-2025-6426 vulnerability details – vuln.today
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