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CVE-2026-26154

HighCVSS 7.5/10Last modified Oct 26, 2026

Description

Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Windows Server 2012	>= 6.2.9200.0, < 6.2.9200.26026
Microsoft	Windows Server 2012 (Server Core installation)	>= 6.2.9200.0, < 6.2.9200.26026
Microsoft	Windows Server 2012 R2	>= 6.3.9600.0, < 6.3.9600.23132
Microsoft	Windows Server 2012 R2 (Server Core installation)	>= 6.3.9600.0, < 6.3.9600.23132
Microsoft	Windows Server 2016	>= 10.0.14393.0, < 10.0.14393.9060
Microsoft	Windows Server 2016 (Server Core installation)	>= 10.0.14393.0, < 10.0.14393.9060
Microsoft	Windows Server 2019	>= 10.0.17763.0, < 10.0.17763.8644
Microsoft	Windows Server 2019 (Server Core installation)	>= 10.0.17763.0, < 10.0.17763.8644
Microsoft	Windows Server 2022	>= 10.0.20348.0, < 10.0.20348.5020
Microsoft	Windows Server 2022, 23H2 Edition (Server Core installation)	>= 10.0.25398.0, < 10.0.25398.2274
Microsoft	Windows Server 2025	>= 10.0.26100.0, < 10.0.26100.32690
Microsoft	Windows Server 2025 (Server Core installation)	>= 10.0.26100.0, < 10.0.26100.32690

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154Vendor Advisory

Timeline

Published: Apr 14, 2026
Last modified: Oct 26, 2026
NVD status: Analyzed

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CVE-2026-26154: High severity, CVSS 7.5 | Vulnix