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) arises from improper input validation in the Windows Server Update Service component of Microsoft Windows Server 2012 (version 6.2.9200.0). It enables an unauthorized attacker to tamper with the system remotely over a network. The CVSS 3.1 base score is 7.5, indicating high severity, with network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability. Microsoft has released an official fix for this vulnerability as detailed in their security advisory.
Potential Impact
An attacker exploiting this vulnerability can cause disruption to the availability of the affected Windows Server 2012 system by tampering with the Windows Server Update Service remotely without authentication. There is no impact on confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154 to remediate this vulnerability.
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
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-26154) arises from improper input validation in the Windows Server Update Service component of Microsoft Windows Server 2012 (version 6.2.9200.0). It enables an unauthorized attacker to tamper with the system remotely over a network. The CVSS 3.1 base score is 7.5, indicating high severity, with network attack vector, low attack complexity, no privileges or user interaction required, and impact limited to availability. Microsoft has released an official fix for this vulnerability as detailed in their security advisory.
Potential Impact
An attacker exploiting this vulnerability can cause disruption to the availability of the affected Windows Server 2012 system by tampering with the Windows Server Update Service remotely without authentication. There is no impact on confidentiality or integrity according to the CVSS vector.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26154 to remediate this vulnerability.
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: 04/14/2026, 17:32:06 UTC
Last enriched: 06/19/2026, 16:58:32 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 94
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