EUVD-2026-56655
GHSA-fgq2-7g5m-ch5h
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel driver heap overflow requiring only a standard user account; no interaction needed; full C/I/A impact via SYSTEM privilege gain.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows Cloud Files Mini Filter Driver (CldFlt.sys) enables a low-privileged local attacker to escalate to SYSTEM-level privileges across a broad range of Windows 10, Windows 11, and Windows Server releases. The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms exploitation requires only a standard user account with no user interaction and no special configuration - a reliable post-access escalation primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local user session on the target Windows system - the attacker must be able to execute code as at least a standard (non-elevated) user (PR:L per CVSS vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score and its underlying vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflect a high-severity local privilege escalation: low complexity, no user interaction, and full C/I/A 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 vendor-released security update from Microsoft via Windows Update or WSUS immediately; the patch brings affected builds to the fixed versions listed above (e.g., Windows 10 22H2 to 10.0.19045.7663, Windows 11 24H2 to 10.0.26100.9168, Windows Server 2025 to 10.0.26100.33296 - see the full list in Affected Products). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Server systems and determine their current CldFlt.sys patch status through Windows Update history or asset management tools. …
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External POC / Exploit Code
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