CVE-2025-2817HIGH 8.8EPSS p39.8%

CVE-2025-2817CVE-2025-2817

Description

Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.

Scoring

CVSS 3.18.8 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS0.52% probability of exploitation · percentile 39.8% · 2026-06-19T12:03:05Z
Published2025-04-29
Last modified2026-04-13

Underlying weaknesses· 1

CWE-22

References

  1. https://bugzilla.mozilla.org/show_bug.cgi?id=1917536
  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/msg00022.html

1

TypeTargetConfidenceTier
WeaknessImproper Limitation of a Pathname to a Restricted Directory ('Path Traversal')cwe-220%live

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