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HIGH · 7.8

CVE-2026-40409

Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

Vulnerability Description

Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows 10 1607< 10.0.14393.9234
MicrosoftWindows 10 1809< 10.0.17763.8880
MicrosoftWindows 10 21H2< 10.0.19044.7417
MicrosoftWindows 10 22H2< 10.0.19045.7417
MicrosoftWindows 11 23H2< 10.0.22631.7219
MicrosoftWindows 11 24H2< 10.0.26100.8655
MicrosoftWindows 11 25H2< 10.0.26200.8655
MicrosoftWindows 11 26H1< 10.0.28000.2269
MicrosoftWindows Server 2012-
MicrosoftWindows Server 2016< 10.0.14393.9234
MicrosoftWindows Server 2019< 10.0.17763.8880
MicrosoftWindows Server 2022< 10.0.20348.5256
MicrosoftWindows Server 2025< 10.0.26100.32995

Related Weaknesses (CWE)

CWE-197

References

FAQ

What is CVE-2026-40409?

CVE-2026-40409 is a vulnerability with a CVSS score of 7.8 (HIGH). Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

How severe is CVE-2026-40409?

CVE-2026-40409 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-40409?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21H2, Microsoft Windows 10 22H2, Microsoft Windows 11 23H2.