CVE-2026-26154
Received Received - Intake
Improper Input Validation in Windows Server Update Service Enables Tampering

Publication date: 2026-04-14

Last updated on: 2026-04-24

Assigner: Microsoft Corporation

Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
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Meta Information
Published
2026-04-14
Last Modified
2026-04-24
Generated
2026-06-16
AI Q&A
2026-04-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-26154
EUVD
EUVD-2026-22376
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
microsoft windows_server_2012 r2
microsoft windows_server_2012 *
microsoft windows_server_2016 to 10.0.14393.9060 (exc)
microsoft windows_server_2019 to 10.0.17763.8644 (exc)
microsoft windows_server_2022 to 10.0.20348.5020 (exc)
microsoft windows_server_2022_23h2 to 10.0.25398.2274 (exc)
microsoft windows_server_2025 to 10.0.26100.32690 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-20 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.
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Impact Analysis

The vulnerability can lead to tampering by an unauthorized attacker over a network, which may affect the integrity or availability of the Windows Server Update Service.

Executive Summary

This vulnerability is caused by improper input validation in the Windows Server Update Service. It allows an unauthorized attacker to perform tampering over a network.

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