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{"affected": [{"configurations": [{"platform": ["arm64-based_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.32690)"}}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Windows 11 Version 24H2", "source": "cna", "vendor": "Microsoft"}, "product": "windows_11_24h2", "vendor": "microsoft"}, {"configurations": [{"platform": ["arm64-based_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26200.0,10.0.26200.8246)"}}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Windows 11 Version 25H2", "source": "cna", "vendor": "Microsoft"}, "product": "windows_11_25h2", "vendor": "microsoft"}, {"configurations": [{"platform": ["arm64-based_systems", "x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.28000.0,10.0.28000.1836)"}}], "enrichment": {"confidence": 86.0, "confidence_source": "matching", "scores": [{"score": 86.0, "source": "matching"}]}, "original": {"product": "Windows 11 version 26H1", "source": "cna", "vendor": "Microsoft"}, "product": "windows_11_26h1", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.32690)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Windows Server 2025", "source": "cna", "vendor": "Microsoft"}, "product": "windows_server_2025", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[10.0.26100.0,10.0.26100.32690)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Windows Server 2025 (Server Core installation)", "source": "cna", "vendor": "Microsoft"}, "product": "windows_server_2025_(server_core_installation)", "vendor": "microsoft"}], "analysis": {"en": {"generated_at": "2026-04-14T20:40:36.265236+00:00", "value": {"mitigation_remediation": ["Apply the Microsoft security update for the affected Windows 11 and Windows Server 2025 releases via Windows Update or the Microsoft Security Response Center update guide.", "Verify that the VBS enclave security feature functions normally after the update.", "If a patch is not yet available, reduce local user privileges and consider disabling or restricting VBS enclave use through group policy settings.", "Continue monitoring Microsoft advisories for additional guidance or remediation steps."], "summary": {"action": "Patch", "impact": "Local privilege escalation via improper access control in the Windows VBS enclave"}, "threat_synthesis": {"affected_systems": "Microsoft Windows 11 24H2, 25H2, and 26H1 \u2013 including the ARM64 build \u2013 and Microsoft Windows Server 2025, which also includes Server Core installations.", "description_and_impact": "An improper access control bug in Windows Virtualization\u2011Based Security (VBS) enclaves lets an attacker who already has authorized local access bypass a security feature. The flaw can allow the attacker to elevate privileges or compromise host integrity by exploiting the enclave\u2019s weakened controls.", "risk_and_exploitability": "The CVSS score of 4.4 indicates a low\u2011to\u2011medium severity assessment. No EPSS value is available, and the vulnerability is not listed in CISA\u2019s KEV catalog. Exploitation requires local, authorized access; no remote attack vector is documented in the supplied information."}}}}, "created": "2026-04-15T15:00:06.176000+00:00", "updated": "2026-04-15T20:45:06.242766+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$windows_11_24h2", "microsoft$PRODUCT$windows_11_25h2", "microsoft$PRODUCT$windows_11_26h1", "microsoft$PRODUCT$windows_server_2025", "microsoft$PRODUCT$windows_server_2025_(server_core_installation)"]}