CVE-2026-26154: CWE-20: Improper Input Validation in Microsoft Windows Server 2012
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-26154) affects Windows Server 2012 (version 6.2.9200.0) and is caused by improper input validation in the Windows Server Update Service. It enables an unauthenticated attacker to tamper with the service remotely, leading to potential denial of service or disruption of availability. The CVSS v3.1 base score is 7.5 (high), reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability. Microsoft has released an official patch to remediate this vulnerability.
Potential Impact
Successful exploitation allows an attacker to tamper with the Windows Server Update Service remotely without authentication, resulting in a denial of service or disruption of availability. Confidentiality and integrity impacts are not indicated. No known active exploitation has been reported.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the provided patch from the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
CVE-2026-26154: CWE-20: Improper Input Validation in Microsoft Windows Server 2012
Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
CVSS v3.1
Score 7.5high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-26154) affects Windows Server 2012 (version 6.2.9200.0) and is caused by improper input validation in the Windows Server Update Service. It enables an unauthenticated attacker to tamper with the service remotely, leading to potential denial of service or disruption of availability. The CVSS v3.1 base score is 7.5 (high), reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability. Microsoft has released an official patch to remediate this vulnerability.
Potential Impact
Successful exploitation allows an attacker to tamper with the Windows Server Update Service remotely without authentication, resulting in a denial of service or disruption of availability. Confidentiality and integrity impacts are not indicated. No known active exploitation has been reported.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the provided patch from the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-02-11T16:24:51.135Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154","vendor":"Microsoft"}]
Threat ID: 69de7a1682d89c981fd6a633
Added to database: 4/14/2026, 5:32:06 PM
Last enriched: 5/19/2026, 10:33:40 AM
Last updated: 5/30/2026, 10:48:12 AM
Views: 52
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