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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authorized low-privilege local account on the target Windows 11 endpoint - the Microsoft advisory description uses 'authorized attacker,' consistent with the CVSS PR:L metric, meaning unauthenticated remote exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score reflects the tension between severe post-exploitation impact (C:H/I:H/A:H) and meaningful exploitation barriers: local-only attack vector (AV:L) and high attack complexity (AC:H) substantially reduce the realistic threat surface compared to a network-vectored or low-complexity flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 11 systems running versions 24H2 or 25H2 with Autopilot enabled; communicate the vulnerability to infrastructure and security teams. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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