Improper Access Control in Windows Deployment Services by Microsoft
CVE-2026-0386

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Windows Server 2025 (server Core Installation)
Vendor
CVE Published:
13 January 2026

What is CVE-2026-0386?

The vulnerability exists due to improper access control in Windows Deployment Services. This flaw can be exploited by an unauthorized attacker to execute arbitrary code on adjacent networks. Effective risk management and applying the relevant security patches are critical to mitigate this vulnerability.

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Affected Version(s)

Windows Server 2008 R2 Service Pack 1 (Server Core installation) x64-based Systems 6.1.7601.0 < 6.1.7601.28117

Windows Server 2008 R2 Service Pack 1 x64-based Systems 6.1.7601.0 < 6.1.7601.28117

Windows Server 2008 Service Pack 2 (Server Core installation) 32-bit Systems 6.0.6003.0 < 6.0.6003.23717

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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