Microsoft has announced a phased plan to disable the hands-free deployment feature in Windows Deployment Services (WDS) after the discovery of a critical remote code execution vulnerability identified as CVE-2026-0386. The vulnerability stems from improper access control that may allow an unauthenticated attacker on an adjacent network to intercept sensitive deployment configuration files and potentially execute malicious code during network-based operating system installations. Windows Deployment Services is a server role used by organizations to deploy Windows operating systems remotely across a network, commonly through the Preboot Execution Environment (PXE). A key component of this service is the hands-free deployment feature, which automates the installation process using an Unattend.xml answer file. This file contains predefined configuration settings, including system parameters and credentials, allowing administrators to perform large-scale deployments without manual interaction. The vulnerability, disclosed on January 13, 2026, is categorized as an improper access control issue (CWE-284). It occurs because the Unattend.xml file can be transmitted over an unauthenticated Remote Procedure Call (RPC) channel. Since the file is exposed through the RemoteInstall share without authentication, an attacker present on the same network segment could intercept it, extract sensitive credentials, or manipulate the file to inject malicious commands that execute during the deployment process. Security researchers warn that successful exploitation could result in SYSTEM-level privileges, allowing attackers to gain extensive control over targeted systems. This access could facilitate lateral movement within enterprise networks and enable attackers to tamper with deployment images, potentially embedding malicious code into operating system installations. Microsoft has assigned the vulnerability a CVSS v3.1 vector of AV:A/AC:H/PR:N/UI:N, indicating high impact on confidentiality, integrity, and availability. The issue affects multiple Windows Server versions, including Server 2008, 2016, 2019, 2022, version 23H2, and Server 2025.
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