Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
References
| Link | Resource |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20856 | Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
15 Jan 2026, 15:20
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20856 - Vendor Advisory | |
| First Time |
Microsoft windows Server 2012
Microsoft windows Server 2019 Microsoft windows Server 2022 23h2 Microsoft windows Server 2016 Microsoft windows 11 24h2 Microsoft windows 11 25h2 Microsoft windows 10 22h2 Microsoft Microsoft windows 10 21h2 Microsoft windows 10 1809 Microsoft windows Server 2025 Microsoft windows Server 2022 Microsoft windows 11 23h2 Microsoft windows 10 1607 |
|
| CPE | cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* |
13 Jan 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-01-13 18:16
Updated : 2026-01-15 15:20
NVD link : CVE-2026-20856
Mitre link : CVE-2026-20856
CVE.ORG link : CVE-2026-20856
JSON object : View
Products Affected
microsoft
- windows_server_2019
- windows_server_2012
- windows_10_1809
- windows_11_24h2
- windows_11_25h2
- windows_11_23h2
- windows_server_2016
- windows_server_2022
- windows_server_2022_23h2
- windows_server_2025
- windows_10_22h2
- windows_10_21h2
- windows_10_1607
CWE
CWE-20
Improper Input Validation