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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
7.8 HIGH

Local artifact-parsing bug needing no privileges but user interaction to open/mount crafted NTFS content; kernel memory corruption yields full C/I/A impact.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 18:24 vuln.today
CVE Published
Jul 14, 2026 - 17:06 cve.org
HIGH 7.8

DescriptionCVE.org

Integer underflow (wrap or wraparound) in Windows NTFS allows an unauthorized attacker to execute code locally.

AnalysisAI

Local code execution in the Microsoft Windows NTFS file-system driver lets an attacker run arbitrary code by inducing a victim to interact with a specially crafted NTFS artifact (e.g., a malicious volume, VHD, or file). The flaw stems from an integer underflow (CWE-191) and spans a broad range of Windows client and server builds from Windows Server 2012 through Windows Server 2025 and Windows 10/11. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft malicious NTFS artifact
Delivery
Deliver via email/USB/download
Exploit
User opens or mounts volume
Execution
NTFS driver parses malformed metadata
Persist
Integer underflow corrupts kernel memory
Impact
Execute arbitrary code locally

Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to interact with attacker-supplied content (CVSS UI:R): the attacker must get a user to open or mount a crafted NTFS-formatted artifact - a malicious volume, VHD/ISO disk image, or file - so that the vulnerable ntfs.sys parsing path processes the malformed metadata that triggers the CWE-191 integer underflow. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score is 7.8 (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), reflecting a local attack vector with low complexity, no privileges required, but mandatory user interaction, and full 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 crafts a malicious NTFS artifact - such as a VHD/ISO or removable-volume image with a corrupted metadata field that triggers the integer underflow - and delivers it via email, download, or a USB drop. When the victim opens or mounts the artifact, the NTFS driver parses the malformed structure and the memory corruption allows attacker code to run locally. …
Remediation Apply the Microsoft security update for CVE-2026-50308 (Patch available per vendor advisory) via Windows Update or WSUS for each affected OS build; the authoritative fix and per-version KB numbers are published at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50308. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Identify and inventory all Windows 10, 11, Server 2012-2025 systems; alert infrastructure teams of patch deployment urgency. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-50308 vulnerability details – vuln.today

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