CVE-2025-4083

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2025-04-29. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

CVSS v3
9.1
EG Score
9.1(medium)
EPSS
32.5%
KEV
Not listed

Published

April 29, 2025

Last Modified

April 13, 2026

Advisory Details (7)

Auto-updated May 21, 2026
Patch available.
generic Patch Available

[SECURITY] [DLA 4172-1] firefox-esr security update

https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html
generic

Security Vulnerabilities fixed in Thunderbird 128.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-32/
generic

Security Vulnerabilities fixed in Thunderbird 138 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-31/
generic

Security Vulnerabilities fixed in Firefox ESR 115.23 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-30/
generic

Security Vulnerabilities fixed in Firefox ESR 128.10 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-29/
generic

Security Vulnerabilities fixed in Firefox 138 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-28/
generic

1958350 - Process isolation bypass using javascript URI links in cross origin frames

https://bugzilla.mozilla.org/show_bug.cgi?id=1958350

Patch Availability(23)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:128.12.0+build1-0ubuntu0.22.04.1) @ jammy2026-05-21ubuntu
redhatthunderbird-0:128.10.0-1.el8_82025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_22025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_02025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_62025-05-15redhat
redhatthunderbird-0:128.10.0-1.el8_42025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_42025-05-15redhat
redhatthunderbird-0:128.10.0-1.el9_22025-05-15redhat
redhatfirefox-0:128.10.0-1.el8_62025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_42025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_22025-05-14redhat
redhatfirefox-0:128.10.0-1.el8_82025-05-14redhat
redhatfirefox-0:128.10.0-1.el9_62025-05-13redhat
redhatfirefox-0:128.10.0-1.el10_02025-05-13redhat
redhatthunderbird-0:128.10.0-1.el10_02025-05-13redhat
redhatthunderbird-0:128.10.0-1.el8_102025-05-12redhat
redhatfirefox-0:128.10.0-1.el9_02025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_42025-05-08redhat
redhatfirefox-0:128.10.0-1.el9_22025-05-08redhat
redhatfirefox-0:128.10.0-1.el7_92025-05-08redhat
redhatthunderbird-0:128.10.0-1.el9_52025-05-05redhat
redhatfirefox-0:128.10.0-1.el9_52025-05-05redhat
redhatfirefox-0:128.10.0-1.el8_102025-05-05redhat

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.

All Vendor Advisories

(23)

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.

Data Freshness Timeline

(refreshed 11× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 131 total refreshes for this CVE.

  1. 2026-07-22 14:07 UTCEPSS rescore
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  3. 2026-07-21 15:24 UTCEPSS rescore
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  22. 2026-07-10 13:22 UTCOSV refresh
  23. 2026-07-09 19:09 UTCEPSS rescore
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  1. 2026-07-07 13:45 UTCEPSS rescore
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  25. 2026-06-22 14:25 UTCEPSS rescore
  26. 2026-06-22 14:25 UTCEPSS rescore
  27. 2026-06-21 22:13 UTCOSV refresh
  28. 2026-06-21 14:56 UTCEPSS rescore
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  30. 2026-06-21 01:59 UTCEPSS rescore
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  49. 2026-06-08 14:16 UTCEPSS rescore
  50. 2026-06-08 14:16 UTCEPSS rescore
  51. 2026-06-07 15:24 UTCEPSS rescore
  52. 2026-06-06 13:47 UTCEPSS rescore
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  54. 2026-06-05 22:46 UTCEPSS rescore
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  60. 2026-06-03 09:10 UTCOSV refresh
  61. 2026-06-02 20:12 UTCEPSS rescore
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  63. 2026-06-01 13:51 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2025-4083?
CVE-2025-4083 is a critical vulnerability published on April 29, 2025. A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability was fixed in Firefox 138, Firefox…
When was CVE-2025-4083 disclosed?
CVE-2025-4083 was first published in the National Vulnerability Database on April 29, 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-2025-4083 actively exploited?
CVE-2025-4083 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-4083?
CVE-2025-4083 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2025-4083?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-4083, 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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