CVE-2026-26154

Windows Server Update Service (WSUS) Tampering Vulnerability

CVE-2026-26154 is fixed in 13 products on 1 platform, first by KB5082198, released April 14, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0106

64th percentile

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

Where it's fixed

Product	Fixed in	Fix	Released
Microsoft
Windows Server 2012		KB5082127	Apr 14, 2026
Windows Server 2012 (Server Core installation)		KB5082127	Apr 14, 2026
Windows Server 2012 R2		KB5082126	Apr 14, 2026
Windows Server 2012 R2 (Server Core installation)		KB5082126	Apr 14, 2026
Windows Server 2016	14393.9060	KB5082198	Apr 14, 2026
Windows Server 2016 (Server Core installation)	14393.9060	KB5082198	Apr 14, 2026
Windows Server 2019	17763.8644	KB5082123	Apr 14, 2026
Windows Server 2019 (Server Core installation)	17763.8644	KB5082123	Apr 14, 2026
Windows Server 2022	20348.5020	KB5082142	Apr 14, 2026
Windows Server 2022 (Server Core installation)	20348.5020	KB5082142	Apr 14, 2026
Windows Server 2022, 23H2 Edition (Server Core installation)	25398.2274	KB5082060	Apr 14, 2026
Windows Server 2025	26100.32690	KB5082063	Apr 14, 2026
Windows Server 2025 (Server Core installation)	26100.32690	KB5082063	Apr 14, 2026

Details

Published
April 14, 2026
Weakness
Improper Input Validation
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154

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