CVE-2026-26154

HIGH

Windows Server Update Service (WSUS) Tampering Vulnerability

Title source: cna
STIX 2.1

Description

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

References (1)

Scores

CVSS v3 7.5
EPSS 0.0026
EPSS Percentile 49.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-20
Status published
Products (19)
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
... and 9 more
Published Apr 14, 2026
Tracked Since Apr 14, 2026