EUVD-2026-56309
GHSA-fc9v-wq29-9mcc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local low-privilege access required to invoke EFS APIs; OOB read yields high confidentiality impact with no write or availability consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Out-of-bounds read in Windows Encrypting File System (EFS) allows an authorized attacker to disclose information locally.
AnalysisAI
Out-of-bounds read in the Windows Encrypting File System (EFS) driver exposes sensitive memory contents to any locally authenticated attacker holding standard user privileges. Affected systems span the entire modern Windows ecosystem - from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025 - making the patch surface extremely broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local Windows user account with at least standard (low) privileges - confirmed by the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 5.5 (Medium) accurately reflects a constrained but meaningful risk profile: the attack vector is strictly local (AV:L), complexity is low (AC:L), and only standard user privileges are required (PR:L), meaning no authentication escalation is needed beyond a normal Windows logon. … 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 remediation is to apply the Microsoft-issued patch for each affected Windows version via Windows Update or WSUS, targeting the fixed build numbers identified in the EUVD data: Windows 10 22H2 to build 10.0.19045.7663 or later, Windows 11 24H2 to 10.0.26100.9168 or later, Windows Server 2025 to 10.0.26100.33296 or later, Windows Server 2022 to 10.0.20348.5499 or later, and equivalent fixed builds for all other listed OS versions. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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