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HIGH · 7.8

CVE-2026-55001

Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.

Vulnerability Description

Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.

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< 10.0.14393.9339
MicrosoftWindows 10 1809< 10.0.17763.9020
MicrosoftWindows Server 2016< 10.0.14393.9339
MicrosoftWindows Server 2019< 10.0.17763.9020
MicrosoftWindows Server 2022< 10.0.20348.5386
MicrosoftWindows Server 2025< 10.0.26100.33158

Related Weaknesses (CWE)

CWE-295

References

FAQ

What is CVE-2026-55001?

CVE-2026-55001 is a vulnerability with a CVSS score of 7.8 (HIGH). Improper certificate validation in Windows Active Directory allows an authorized attacker to elevate privileges locally.

How severe is CVE-2026-55001?

CVE-2026-55001 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-2026-55001?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022.