EUVD-2026-56734
GHSA-g9vw-vgv8-pmm9
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only vector and race-condition complexity justify AV:L/AC:H; authorized low-privilege account requirement maps to PR:L; full post-exploitation SYSTEM access yields C:H/I:H/A:H with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Autopilot allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Autopilot on Windows 11 versions 24H2 and 25H2 arises from a use-after-free memory corruption flaw, enabling a local low-privileged attacker to achieve full SYSTEM-level access with complete confidentiality, integrity, and availability impact. High attack complexity (AC:H) constrains opportunistic exploitation, making this most relevant to insider threat and post-breach lateral movement scenarios rather than broad automated attacks. No public exploit code has been identified at time of analysis, and the vulnerability has not been added to the CISA KEV catalog.
Technical ContextAI
CWE-416 (Use After Free) describes memory corruption arising when software continues to reference a memory region after it has been freed, potentially allowing an attacker to control the freed region via a subsequent allocation and redirect execution flow or corrupt program state. Windows Autopilot is an enterprise device provisioning and lifecycle management platform integrated into Windows 11, responsible for enrollment, policy application, and deployment workflows. Affected builds based on EUVD version data are Windows 11 Version 24H2 (10.0.26100.0 through 10.0.26100.9167) and Windows 11 Version 25H2 (10.0.26200.0 through 10.0.26200.9167). The CVSS AV:L/AC:H vector is consistent with a race condition between a memory free and subsequent reallocation within the Autopilot component, requiring precise timing to exploit reliably. The Denial of Service tag in the intelligence also suggests the UAF may be reachable in a non-control-flow path that causes a crash without escalation.
RemediationAI
The primary fix is to update Windows 11 Version 24H2 to build 10.0.26100.9168 or Windows 11 Version 25H2 to build 10.0.26200.9168, as derived from the ENISA EUVD version bounds confirmed against the Microsoft MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65778. Enterprise environments should deploy the update via Windows Update, Windows Server Update Services (WSUS), or Microsoft Endpoint Manager. If immediate patching is not feasible, a targeted compensating control is to restrict local interactive logon rights on Autopilot-managed endpoints to the minimum required accounts, reducing the pool of low-privilege principals who could trigger the vulnerable code path; note that overly restricting logon access may interfere with Autopilot provisioning and helpdesk workflows and should be evaluated against operational needs. No vendor-documented workaround to disable the specific vulnerable Autopilot code path without applying the patch was present in the available data.
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Same weakness CWE-416 – Use After Free
View allSame technique Denial Of Service
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External POC / Exploit Code
Leaving vuln.today