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Severity by source

Vendor (microsoft) PRIMARY
HIGH
qualitative
NVD
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.8 MEDIUM
cvss
vuln.today AI
7.8 HIGH

Local EoP requiring an existing low-privileged foothold (AV:L, PR:L), no user interaction, and a kernel UAF yielding full SYSTEM-level C/I/A impact within unchanged scope.

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

Primary rating from Vendor (microsoft).

CVSS VectorNVD

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

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 20:05 vuln.today
CVE Published
Jul 14, 2026 - 17:07 nvd
HIGH 7.8

DescriptionNVD

Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in the Microsoft Windows Kernel lets an authenticated attacker who already has low-privileged code execution on a host elevate to SYSTEM by exploiting a use-after-free (CWE-416) memory corruption. It affects a broad range of supported Windows client and server builds - Windows 10 (1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2019/2022/2025 - and Microsoft has released a patch. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain low-privileged local foothold
Delivery
Run crafted trigger program
Exploit
Trigger kernel use-after-free
Execution
Groom pool to reclaim freed object
Persist
Gain kernel read/write primitive
Impact
Elevate to SYSTEM

Vulnerability AssessmentAI

Exploitation Exploitation requires the attacker to already have local, authenticated, low-privileged access to the target Windows host (CVSS PR:L, AV:L) - this is a post-compromise elevation primitive, not a remote entry point, so a prior foothold (valid credentials, an existing malware/agent, or another initial-access vulnerability) is the key prerequisite and the primary limiting factor. … 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, and full confidentiality/integrity/availability impact within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker first obtains ordinary low-privileged code execution on a Windows host - for example via a phishing payload, a compromised standard user account, or a foothold from another exploited application. They then run a crafted program that triggers the kernel use-after-free, grooms the kernel pool to reclaim the freed object with attacker-controlled data, and escalates to SYSTEM to disable security tooling, install persistence, or move laterally. …
Remediation Apply the Microsoft security update for CVE-2026-50478 for your specific Windows SKU and build via Windows Update or WSUS; the patch is available per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50478 (Patch available per vendor advisory - consult the MSRC page for the exact KB/build number for each affected version). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all Windows 10 (versions 1809, 21H2, 22H2), Windows 11 (versions 24H2, 25H2, 26H1), and Windows Server (2019, 2022, 2025) systems in production, prioritizing servers handling sensitive data and administrative workstations. …

Sign in for detailed remediation steps and compensating controls.

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

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EUVD-2026-44087 vulnerability details – vuln.today

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