CVE-2026-26154

published 2026-04-14

CVE-2026-26154: Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

high 7.5 CVSS 3.1

AV N AC L PR N UI N S U C N I N A H

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

Affected

12 ranges

Vendor	Product	Version range	Fixed in
microsoft	windows_server_2012	—	—
microsoft	windows_server_2012	>= 6.2.9200.0 < 6.2.9200.26026	6.2.9200.26026
microsoft	windows_server_2012_r2	>= 6.3.9600.0 < 6.3.9600.23132	6.3.9600.23132
microsoft	windows_server_2016	< 10.0.14393.9060	10.0.14393.9060
microsoft	windows_server_2016	>= 10.0.14393.0 < 10.0.14393.9060	10.0.14393.9060
microsoft	windows_server_2019	< 10.0.17763.8644	10.0.17763.8644
microsoft	windows_server_2019	>= 10.0.17763.0 < 10.0.17763.8644	10.0.17763.8644
microsoft	windows_server_2022	< 10.0.20348.5020	10.0.20348.5020
microsoft	windows_server_2022	>= 10.0.20348.0 < 10.0.20348.5020	10.0.20348.5020
microsoft	windows_server_2022_23h2	< 10.0.25398.2274	10.0.25398.2274
microsoft	windows_server_2025	< 10.0.26100.32690	10.0.26100.32690
microsoft	windows_server_2025	>= 10.0.26100.0 < 10.0.26100.32690	10.0.26100.32690

CWE-20