CVE-2025-4083CRITICAL 9.1EPSS p28.1%

CVE-2025-4083CVE-2025-4083

Description

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.36% probability of exploitation · percentile 28.1% · 2026-06-19T12:03:05Z
Published2025-04-29
Last modified2026-04-13

Underlying weaknesses· 1

CWE-653

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1958350
  2. https://www.mozilla.org/security/advisories/mfsa2025-28/
  3. https://www.mozilla.org/security/advisories/mfsa2025-29/
  4. https://www.mozilla.org/security/advisories/mfsa2025-30/
  5. https://www.mozilla.org/security/advisories/mfsa2025-31/
  6. https://www.mozilla.org/security/advisories/mfsa2025-32/
  7. https://lists.debian.org/debian-lts-announce/2025/05/msg00024.html

1

TypeTargetConfidenceTier
WeaknessImproper Isolation or Compartmentalizationcwe-6530%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.