EUVD-2026-43861
GHSA-gfvf-9r5v-2jp2
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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated access with low-level privileges (CVSS PR:L, AV:L) - this is a second-stage elevation primitive, not a remote entry point. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, 7.8 High) describes a classic local elevation-of-privilege primitive: an attacker needs an existing foothold with at least low-level user privileges, but no user interaction and low attack complexity, and on success gains full CIA impact within the same security scope (S:U). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged access to a Windows host - for example via phishing, a compromised service account, or a standard user session on a shared terminal server - runs a crafted local program that feeds a malformed object into the Windows Notification component, triggering the incorrect type conversion. The resulting type confusion is leveraged to execute code at SYSTEM, giving full control of the machine. … |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Windows Server instances across your environment and segment them by criticality. …
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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
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