EUVD-2026-56652
GHSA-qw63-qw4q-gppx
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel driver flaw exploitable by any authenticated user with no interaction; full C/I/A impact reflects SYSTEM-level privilege gain.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Windows Projected File System allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Projected File System (ProjFS) via an integer overflow allows an authenticated local user to gain full SYSTEM-level control over the affected host. The flaw spans a wide range of actively supported Windows releases - from Windows 10 21H2 through Windows 11 26H1, and both Windows Server 2022 and 2025 - making it a broadly applicable post-compromise escalation primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local user session - an attacker must already have code running under a standard (low-privilege) Windows account on the target system. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields a score of 7.8, reflecting a locally exploitable, low-complexity flaw requiring only a standard user account with no user interaction. … 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 | Apply Microsoft's security update via Windows Update or WSUS immediately, targeting the minimum fixed builds identified in the EUVD advisory: Windows Server 2022 must reach 10.0.20348.5499 or later; Windows 10 21H2 must reach 10.0.19044.7663 or later; Windows 10 22H2 must reach 10.0.19045.7663 or later; Windows 11 23H2 must reach 10.0.22631.7517 or later; Windows 11 24H2 and Server 2025 must reach 10.0.26100.9168 (client) or 10.0.26100.33296 (server) or later; Windows 11 25H2 must reach 10.0.26200.9168 or later; Windows 11 26H1 must reach 10.0.28000.2704 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit your infrastructure to identify all systems running Windows 10 21H2 through 26H1, Windows Server 2022, or Windows Server 2025, and prioritize patch deployment for domain controllers, privileged access workstations, and business-critical systems. …
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Integer Overflow
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External POC / Exploit Code
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