Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.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.
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Same weakness CWE-704 – Incorrect Type Conversion or Cast
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43861
GHSA-gfvf-9r5v-2jp2