What is the CVSS score of EUVD-2026-43861?

EUVD-2026-43861 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.3%.

Which versions of Microsoft Windows are affected by EUVD-2026-43861?

CVE-2026-50337 in the Windows Notification component enables authenticated low-privileged users to escalate to SYSTEM-level access across Windows 10, 11, and Server platforms.. A patch is available.

How to fix or mitigate EUVD-2026-43861?

Within 24 hours, inventory all Windows 10, 11, and Windows Server instances across your environment and segment them by criticality. Within 7 days, apply vendor patch in a staging environment and validate compatibility with mission-critical applications and dependencies. Within 30 days, complete full patch deployment across all vulnerable systems, with priority given to domain controllers, privileged access workstations, and systems handling sensitive data.

Microsoft Windows EUVD-2026-43861

| CVE-2026-50337 HIGH

Incorrect Type Conversion or Cast (CWE-704)

2026-07-14 microsoft

GHSA-gfvf-9r5v-2jp2

Information Disclosure Microsoft Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025 Windows 10 Version 1607 Windows 10 Version 1809 Windows 10 Version 21H2 Windows 10 Version 22H2 Windows Server 2016 Server Core Installation Windows Server 2019 Server Core Installation Windows 11 Version 24H2 Windows 11 Version 25H2 Windows 11 Version 26H1 Windows Server 2025 Server Core Installation

7.8

CVSS 3.1 · Vendor: microsoft

Severity by source

Vendor (microsoft) PRIMARY

7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

vuln.today AI

7.8 HIGH

Local EoP requiring an existing low-privileged foothold (AV:L/PR:L), no user interaction and low complexity, yielding SYSTEM-level control so full C/I/A within an 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 VectorVendor: microsoft

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Jul 14, 2026 - 21:34 vuln.today

CVE Published

Jul 14, 2026 - 17:06 nvd

HIGH 7.8

DescriptionCVE.org

Incorrect type conversion or cast in Windows Notification allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in the Windows Notification component lets an already-authenticated low-privileged user elevate to higher privileges (SYSTEM) across a broad range of Windows 10, Windows 11, and Windows Server releases. The flaw stems from an incorrect type conversion/cast (CWE-704) and carries a CVSS 7.8 (AV:L/AC:L/PR:L/UI:N) with high confidentiality, integrity, and availability impact. Microsoft has released a patch; there is no public exploit identified at time of analysis and the CVE is not listed in CISA KEV.

Technical ContextAI

The vulnerability lives in the Windows Notification subsystem, a core OS component present across all listed client and server SKUs (Windows 10 1607 through Windows 11 26H1, and Windows Server 2016 through 2025). The root cause is CWE-704 (Incorrect Type Conversion or Cast): code interprets a data object as a type it is not, so an attacker who controls the input can cause the component to misread a value as a pointer, handle, or size field. In a privileged OS service this type confusion typically yields controlled memory corruption or object misuse that can be steered into arbitrary code execution in the security context of the service. The affected CPEs all reference the Microsoft OS platform itself rather than a bolt-on application, confirming this is an in-box OS defect rather than a third-party dependency.

RemediationAI

Apply the Microsoft security update for CVE-2026-50337 (patch available per vendor advisory) through your normal Windows Update / WSUS / Intune / SCCM channel to every affected Windows 10, Windows 11, and Windows Server system. Pull the specific KB and fixed build numbers directly from the advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50337, since exact fix versions are not provided in the input. No official workaround is documented; because exploitation requires an existing local low-privileged foothold, meaningful compensating controls until patching are to restrict interactive and remote-interactive logon rights to trusted accounts, enforce least privilege and application allowlisting to limit which unprivileged code can run, and prioritize patch deployment on multi-user or shared systems (RDS/terminal/jump hosts) where untrusted users can execute code. These controls shrink the pool of principals able to reach the vulnerable code path but do not remove the flaw, so patching remains the only complete fix.