EUVD-2026-73359
GHSA-6xxg-24pf-j6jx
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Local attack requiring low-privilege account; missing auth check yields integrity-only impact with no confidentiality or availability consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Missing authentication for critical function in Windows Cloud Files Mini Filter Driver allows an authorized attacker to perform tampering locally.
AnalysisAI
Local tampering of the Windows Cloud Files Mini Filter Driver (CldFlt.sys) is possible because the driver exposes a critical function without adequate authentication checks, allowing a low-privileged local attacker to modify protected data or state that would normally require higher authorization. Affecting Windows 10 through Windows 11 and Windows Server 2019 through 2025 across a wide range of builds, the flaw yields a high integrity impact with no confidentiality or availability consequence. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing local low-privilege user account on the target Windows system - no remote access vector exists. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N, score 5.5) accurately characterizes the threat surface: exploitation requires local code execution as any low-privilege Windows user, and the scope is contained to the local system with no confidentiality or availability impact. … 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 the Microsoft security update distributed via Windows Update or Microsoft Update Catalog, which delivers patched CldFlt.sys builds addressing all affected version ranges listed above. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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