CVE-2026-20940

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"availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-20940", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-01-14T04:56:51.242064Z", "version": "2.0.3"}}]}, "published": "2026-01-13T18:16:21.313", "references": [{"source": "secure@microsoft.com", "tags": ["Vendor Advisory"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20940"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-822"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"analysis": {"en": {"generated_at": "2026-04-16T08:17:32.718264+00:00", "value": {"mitigation_remediation": ["Install the Microsoft security update that addresses CVE\u20112026\u201120940 as published on the Microsoft Security Response Center link.", "If the Cloud Files feature is not required, disable the Cloud Files Mini Filter Driver via Group Policy or registry settings to remove the vulnerable component from the system.", "Restrict local user accounts from accessing Cloud Files or shared resources that trigger the mini filter driver, limiting the opportunity for an attacker to exploit the heap overflow."], "summary": {"action": "Immediate Patch", "impact": "Local Privilege Escalation"}, "threat_synthesis": {"affected_systems": "Affected platforms include Windows 10 build releases 1607, 1809, 21H2, and 22H2, as well as Windows 11 releases 22H3 and 23H2; all Windows Server editions from 2008\u202fR2\u202fSP1 and 2008\u202fSP2 through to Windows Server 2022 are impacted. Both 32\u2011bit and 64\u2011bit architectures, along with ARM64 configurations where applicable, run the vulnerable mini filter driver.", "description_and_impact": "This vulnerability is a heap-based buffer overflow in the Windows Cloud Files Mini Filter Driver that can be triggered by a locally authenticated user supplying crafted input. An attacker who is authorized to use Cloud Files can manipulate the buffer, obtain elevated SYSTEM privileges, and thereby run arbitrary code with full system rights. The weakness is classified as CWE\u2011822.", "risk_and_exploitability": "The CVSS score of 7.8 indicates high severity, while the EPSS score of less than 1% suggests a low current probability of exploitation. The vulnerability is not in CISA\u2019s KEV catalog, meaning no publicly known exploits are confirmed. Likely attack vectors are local, requiring an authenticated user who has permission to interact with Cloud Files or the mini filter driver; disabling the driver or restricting access can mitigate the threat."}}}}, "created": "2026-04-16T08:30:29.831226+00:00", "updated": "2026-04-16T08:30:29.831237+00:00", "vendors": []}