CVE-2026-26154

Published: Apr 14, 2026Modified: Jun 17, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: secure@microsoft.com (Secondary)

Description

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

Affected (7)

Products: Microsoft: Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2022 23h2, Windows Server 2025

6 products

Windows Server 2012

Windows Server 2016

Windows Server 2019

Windows Server 2022

Windows Server 2022 23h2

Windows Server 2025

Configuration A

7 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2
Microsoft Windows Server 2016	Before 10.0.14393.9060
Microsoft Windows Server 2019	Before 10.0.17763.8644
Microsoft Windows Server 2022	Before 10.0.20348.5020
Microsoft Windows Server 2022 23h2	Before 10.0.25398.2274
Microsoft Windows Server 2025	Before 10.0.26100.32690

Related CWEs

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

References (1)

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

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.