Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel UAF triggerable by a standard user with no interaction (AV:L/AC:L/PR:L/UI:N), yielding SYSTEM-level control so C/I/A all High, scope unchanged.
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) lets an authenticated low-privileged user corrupt kernel memory to gain SYSTEM-level control. The flaw is a use-after-free (CWE-416) affecting a broad range of Windows client and server builds from Windows 10 1809 through Windows 11 26H1 and Windows Server 2019-2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local, authenticated access to the target Windows system: the CVSS vector's PR:L means the attacker must already hold at least low/standard-user privileges (not remote or unauthenticated), and AV:L means the trigger occurs on the local machine, not over the network. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (base 7.8, High) describes a locally-exploitable, low-complexity flaw requiring only low privileges and no user interaction, yielding full confidentiality, integrity, and availability impact within an unchanged scope - a classic local elevation-of-privilege profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host - for example a standard domain user, a compromised service account, or code running after a phishing-based initial access - triggers the crafted file operations that drive the Cloud Files mini-filter into using freed kernel memory, grooms the kernel heap to control the reused allocation, and elevates to SYSTEM. No user interaction is required and attack complexity is low, though local access is a prerequisite; no public POC has been identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-58613 (Vendor-released patch: available per Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58613) via Windows Update or WSUS/SCCM for each affected SKU; consult the MSRC update guide for the exact KB and fixed build for your specific version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all Windows 10, Windows 11, and Windows Server systems (2019-2025) in the organization to identify patch status; immediately apply the Microsoft security patch released for CVE-2026-58613 to test environments and all systems classified as Tier-1 critical infrastructure (domain controllers, file servers, identity systems). …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44304
GHSA-9f2j-4qc4-329w