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

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Windows Server 2012 Subscribe
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Windows Server 2016 Subscribe
Windows Server 2019 Subscribe
Windows Server 2022 Subscribe
Windows Server 2025 Subscribe
Windows Server 23h2 Subscribe
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Fixes

Solution

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Workaround

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History

Tue, 14 Apr 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 14 Apr 2026 17:30:00 +0000

Type Values Removed Values Added
Description Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
Title Windows Server Update Service (WSUS) Tampering Vulnerability
First Time appeared Microsoft
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
Weaknesses CWE-20
CPEs cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_23h2:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-04-14T17:59:21.141Z

Reserved: 2026-02-11T16:24:51.135Z

Link: CVE-2026-26154

cve-icon Vulnrichment

Updated: 2026-04-14T17:59:16.877Z

cve-icon NVD

Status : Received

Published: 2026-04-14T18:16:46.950

Modified: 2026-04-14T18:16:46.950

Link: CVE-2026-26154

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses