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HIGH · 7.8

CVE-2026-26128

Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.

Vulnerability Description

Improper authentication in Windows SMB Server 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< 10.0.14393.8957
MicrosoftWindows 10 1809< 10.0.17763.8511
MicrosoftWindows 10 21H2< 10.0.19044.7058
MicrosoftWindows 10 22H2< 10.0.19045.7058
MicrosoftWindows 11 23H2< 10.0.22631.6783
MicrosoftWindows 11 24H2< 10.0.26100.7979
MicrosoftWindows 11 25H2< 10.0.26200.7979
MicrosoftWindows 11 26H1< 10.0.28000.1719
MicrosoftWindows Server 2012-
MicrosoftWindows Server 2016< 10.0.14393.8957
MicrosoftWindows Server 2019< 10.0.17763.8511
MicrosoftWindows Server 2022< 10.0.20348.4830
MicrosoftWindows Server 2022 23H2< 10.0.25398.2207
MicrosoftWindows Server 2025< 10.0.26100.32463

Related Weaknesses (CWE)

CWE-287

References

FAQ

What is CVE-2026-26128?

CVE-2026-26128 is a vulnerability with a CVSS score of 7.8 (HIGH). Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.

How severe is CVE-2026-26128?

CVE-2026-26128 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-2026-26128?

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.