MSRC_CVE-2026-0386
Vulnerability from csaf_microsoft - Published: 2026-01-13 08:00 - Updated: 2026-01-13 08:00Summary
Windows Deployment Services Remote Code Execution Vulnerability
Notes
Additional Resources
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer
The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action
Required. The vulnerability documented by this CVE requires customer action to resolve.
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"text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
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"vulnerabilities": [
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"cve": "CVE-2026-0386",
"cwe": {
"id": "CWE-284",
"name": "Improper Access Control"
},
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"category": "general",
"text": "Microsoft",
"title": "Assigning CNA"
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{
"category": "faq",
"text": "Admins should take the following steps to be protected from CVE-2026-0386:\nAudit existing WDS usage and identify hands-free deployments.\nOpt in for protection by configuring the registry settings described in: Windows Deployment Services (WDS) Hands-Free Deployment Hardening Guidance. This will provide immediate protection.\nThis security protection will be enabled by default in a future security update release and no additional administrator action will be required.\nTo\u00a0address this\u00a0vulnerability, by default the hands-free deployment feature will not be supported beginning with a security update in a future release in mid-2026.\nThe legacy WDS workflow transmits unattend.xml over unauthenticated RPC, exposing sensitive credentials during PXE boot. This creates a security risk, including potential machine-in-the-middle (MITM) attacks. To strengthen security posture, Microsoft is enforcing authenticated RPC by default and removing the insecure workflow.\nEven in isolated networks, unauthenticated RPC introduces attack surfaces that can be exploited internally. Security best practices require eliminating unencrypted credential transmission and enforcing authenticated channels.\nHands-free deployments that rely on unauthenticated RPC will no longer work by default. Administrators can override this behavior via a registry key (See Windows Deployment Services (WDS) Hands-Free Deployment Hardening Guidance, but this is not recommended for production environments.\nPlease see Windows Deployment Services (WDS) boot.wim support for alternate recommendations by Microsoft.",
"title": "Are there additional steps I need to take to be protected from this vulnerability?"
},
{
"category": "faq",
"text": "The attacker must inject themselves into the logical network path between the target and the resource requested by the victim to read or modify network communications. This is called a machine-in-the-middle (MITM) attack.",
"title": "According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?"
},
{
"category": "faq",
"text": "An authenticated attacker could exploit this vulnerability with LAN access.",
"title": "According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?"
}
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"environmentalsScore": 0.0,
"exploitCodeMaturity": "UNPROVEN",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"remediationLevel": "OFFICIAL_FIX",
"reportConfidence": "CONFIRMED",
"scope": "UNCHANGED",
"temporalScore": 6.5,
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Remote Code Execution"
},
{
"category": "exploit_status",
"details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Unlikely"
}
],
"title": "Windows Deployment Services Remote Code Execution Vulnerability"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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