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
Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| 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
KEV
| 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. |
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability impact me? :
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.
Can you explain this vulnerability to me?
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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