CVE-2026-33826: CWE-20: Improper Input Validation in Microsoft Windows Server 2012 R2
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-33826) arises from improper input validation in Windows Active Directory on Windows Server 2012 R2 (version 6.3.9600.0). An attacker with limited privileges and adjacent network access can exploit this flaw to execute arbitrary code, potentially compromising system confidentiality, integrity, and availability. Microsoft has published an official fix addressing this issue.
Potential Impact
Successful exploitation allows an authorized attacker on an adjacent network to execute arbitrary code on the affected Windows Server 2012 R2 system. This can lead to full compromise of the system, affecting confidentiality, integrity, and availability of data and services.
Mitigation Recommendations
An official patch is available from Microsoft. Administrators should apply the update provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-33826: CWE-20: Improper Input Validation in Microsoft Windows Server 2012 R2
Description
Improper input validation in Windows Active Directory allows an authorized attacker to execute code over an adjacent network.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-33826) arises from improper input validation in Windows Active Directory on Windows Server 2012 R2 (version 6.3.9600.0). An attacker with limited privileges and adjacent network access can exploit this flaw to execute arbitrary code, potentially compromising system confidentiality, integrity, and availability. Microsoft has published an official fix addressing this issue.
Potential Impact
Successful exploitation allows an authorized attacker on an adjacent network to execute arbitrary code on the affected Windows Server 2012 R2 system. This can lead to full compromise of the system, affecting confidentiality, integrity, and availability of data and services.
Mitigation Recommendations
An official patch is available from Microsoft. Administrators should apply the update provided in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826 to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-03-24T00:52:01.352Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-33826","vendor":"Microsoft"}]
Threat ID: 69de7a3b82d89c981fd6cf48
Added to database: 4/14/2026, 5:32:43 PM
Last enriched: 4/14/2026, 5:49:30 PM
Last updated: 4/15/2026, 6:45:24 AM
Views: 13
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