CVE-2026-20856
Unknown
Unknown - Not Provided
Improper Input Validation in Windows Server Update Service Enables Remote Code Execution
Publication date: 2026-01-13
Last updated on: 2026-01-13
Assigner: Microsoft Corporation
Description
Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_server_update_service | * |
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
Can you explain this vulnerability to me?
This vulnerability is due to improper input validation in Windows Server Update Service, which allows an unauthorized attacker to execute code remotely over a network.
How can this vulnerability impact me? :
An attacker exploiting this vulnerability can execute arbitrary code on the affected system remotely, potentially leading to full compromise of confidentiality, integrity, and availability of the system.
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