CVE-2025-6426

HIGHNVD 8.88.8—

8.8

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.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 33.4%
KEV: Not listed

Published

June 24, 2025

Last Modified

April 13, 2026

Advisory Details (5)

Auto-updated May 21, 2026

No patch confirmed yet.

generic

Security Vulnerabilities fixed in Thunderbird 128.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-55/

generic

Security Vulnerabilities fixed in Thunderbird 140 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-54/

generic

Security Vulnerabilities fixed in Firefox ESR 128.12 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-53/

generic

Security Vulnerabilities fixed in Firefox 140 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-51/

generic

1964385 - (CVE-2025-6426) MacOS Download protection bypass With Terminal File

https://bugzilla.mozilla.org/show_bug.cgi?id=1964385

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	xul-ext-lightning (1:128.12.0+build1-0ubuntu0.22.04.1) @ jammy	2026-05-21	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-345Insufficient Verification of Data Authenticity

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

UbuntuUSN-7663-1MEDIUM
Thunderbird vulnerabilities

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:13 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
2026-05-26 07:18 UTCepss_batch

Frequently asked(5)

What is CVE-2025-6426?

CVE-2025-6426 is a high vulnerability published on June 24, 2025. 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.

When was CVE-2025-6426 disclosed?

CVE-2025-6426 was first published in the National Vulnerability Database on June 24, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-6426 actively exploited?

CVE-2025-6426 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 33.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-6426?

CVE-2025-6426 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2025-6426?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-6426, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-6426

Published

Last Modified

Advisory Details (5)

Security Vulnerabilities fixed in Thunderbird 128.12 — Mozilla

Security Vulnerabilities fixed in Thunderbird 140 — Mozilla

Security Vulnerabilities fixed in Firefox ESR 128.12 — Mozilla

Security Vulnerabilities fixed in Firefox 140 — Mozilla

1964385 - (CVE-2025-6426) MacOS Download protection bypass With Terminal File

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-6426?

Same vendor

Same CWE

CVE-2025-6426

📅 Published

🔄 Last Modified

📋 Advisory Details (5)

Security Vulnerabilities fixed in Thunderbird 128.12 — Mozilla

Security Vulnerabilities fixed in Thunderbird 140 — Mozilla

Security Vulnerabilities fixed in Firefox ESR 128.12 — Mozilla

Security Vulnerabilities fixed in Firefox 140 — Mozilla

1964385 - (CVE-2025-6426) MacOS Download protection bypass With Terminal File

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-6426?

🔗 Related CVEs(same vendor + same CWE)

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Advisory Details (5)

Frequently asked(5)

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