EUVD-2026-44296
GHSA-m7m8-cc54-66jh
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel EoP by an authenticated low-privileged user (AV:L, PR:L, UI:N); use-after-free yields full SYSTEM control giving C:H/I:H/A:H with unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.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 an authenticated low-privileged user to elevate to SYSTEM by triggering a use-after-free memory corruption condition. The flaw affects a broad range of Windows client and server releases (Windows 10 1809 through Windows 11 26H1, and Windows Server 2019 through 2025) and was reported by Microsoft. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access with at least low privileges (CVSS PR:L) and the ability to execute code on the target host - this is a post-compromise privilege escalation, not a remote entry point. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, and high impact to confidentiality, integrity, and availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard (low-privileged) user - via phishing, a compromised service account, or a malicious insider - runs a crafted local program that manipulates cloud placeholder file operations to force the cldflt.sys driver to dereference a freed kernel object. By grooming the kernel pool to reoccupy the freed allocation, the attacker corrupts kernel memory to gain arbitrary code execution as SYSTEM. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-58536 for your specific Windows SKU as documented at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58536 (delivered through the standard cumulative/Patch Tuesday channel). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all affected Windows 10 (1809+), Windows 11, and Windows Server (2019-2025) systems and confirm patch availability from Microsoft via Windows Update or WSUS. …
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External POC / Exploit Code
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