EUVD-2026-73216
GHSA-66ww-vw4w-cj43
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local UAF in kernel driver requiring low-privilege account and race-condition timing (AC:H); full kernel compromise yields C:H/I:H/A:H within the OS boundary (S:U).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Cloud Files Mini Filter Driver (cldflt.sys) allows a low-privileged, authenticated attacker to achieve full SYSTEM-level compromise across Windows 10, Windows 11, and Windows Server 2019 through 2025. The flaw is a use-after-free (CWE-416) in the kernel-mode filter driver that underpins Windows cloud storage integration (OneDrive and compatible providers), where freed memory is reused in a way that allows an attacker to corrupt kernel objects and redirect execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, low-privileged user account on the target Windows system (PR:L per CVSS vector) - the Microsoft advisory explicitly describes an 'authorized attacker,' meaning anonymous or unauthenticated remote exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects a local privilege escalation that requires existing user access and high exploitation complexity, most likely due to a race condition inherent to UAF exploitation in the kernel I/O path. … 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 for the respective Windows version, targeting the fixed builds identified in the EUVD data: Windows 10 1809/Server 2019 should be patched to build 10.0.17763.9245 or later; Windows 10 21H2 to 10.0.19044.7725; Windows 10 22H2 to 10.0.19045.7725; Windows 11 23H2 to 10.0.22631.7582; Windows 11 24H2 and Server 2025 to 10.0.26100.9445 (desktop) or 10.0.26100.33438 (server); Windows 11 25H2 to 10.0.26200.9445; Windows 11 26H1 to 10.0.28000.2954; and Windows Server 2022 to 10.0.20348.5622. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Server 2019-2025 systems in your environment and identify those with enabled OneDrive or cloud storage integration, prioritizing critical infrastructure and administrative workstations. …
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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
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