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CVE-2026-26128NVD
Vulnerability Summary
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
CVSS v3.1 Base Metrics — Score 7.8 (HIGH)
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
Affected & Patched Versions
- Microsoft Windows 10 1607 < 10.0.14393.8957
- Microsoft Windows 10 1809 < 10.0.17763.8511
- Microsoft Windows 10 21h2 < 10.0.19044.7058
- Microsoft Windows 10 22h2 < 10.0.19045.7058
- Microsoft Windows 11 23h2 < 10.0.22631.6783
- Microsoft Windows 11 24h2 < 10.0.26100.7979
- Microsoft Windows 11 25h2 < 10.0.26200.7979
- Microsoft Windows 11 26h1 < 10.0.28000.1719
- Microsoft Windows Server 2012
- Microsoft Windows Server 2016 < 10.0.14393.8957
- Microsoft Windows Server 2019 < 10.0.17763.8511
- Microsoft Windows Server 2022 < 10.0.20348.4830
- Microsoft Windows Server 2022 23h2 < 10.0.25398.2207
- Microsoft Windows Server 2025 < 10.0.26100.32463
- Microsoft Windows 10 1607 10.0.14393.8957
- Microsoft Windows 10 1809 10.0.17763.8511
- Microsoft Windows 10 21h2 10.0.19044.7058
- Microsoft Windows 10 22h2 10.0.19045.7058
- Microsoft Windows 11 23h2 10.0.22631.6783
- Microsoft Windows 11 24h2 10.0.26100.7979
- Microsoft Windows 11 25h2 10.0.26200.7979
- Microsoft Windows 11 26h1 10.0.28000.1719
- Microsoft Windows Server 2016 10.0.14393.8957
- Microsoft Windows Server 2019 10.0.17763.8511
- Microsoft Windows Server 2022 10.0.20348.4830
- Microsoft Windows Server 2022 23h2 10.0.25398.2207
- Microsoft Windows Server 2025 10.0.26100.32463
External References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128
- https://www.vicarius.io/vsociety/posts/cve-2026-26128-detection-script-improper-authentication-in-windows-smb-server
- https://www.vicarius.io/vsociety/posts/cve-2026-26128-mitigation-script-improper-authentication-in-windows-smb-server