EUVD-2026-43950
GHSA-xc3q-x7gf-f2j9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local, low-complexity elevation requiring an existing low-privileged session (AV:L/AC:L/PR:L), no user interaction, yielding SYSTEM-level full C/I/A impact 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
Access of resource using incompatible type ('type confusion') in Windows Connected User Experiences and Telemetry allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Connected User Experiences and Telemetry service (DiagTrack) lets an already-authenticated user run arbitrary code with SYSTEM-level rights by triggering a CWE-843 type-confusion condition. The flaw affects a broad range of currently-supported Windows client and server builds, from Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess an authenticated local session on the target (CVSS PR:L, AV:L) - this is a local elevation-of-privilege bug, not a remote one, so it cannot be triggered over the network or without a prior foothold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H scores 7.8 (High) and is internally consistent with the description: local attack vector, low complexity, low privileges already required, no user interaction, and full high impact to confidentiality, integrity, and availability - the classic profile of an authenticated-user-to-SYSTEM elevation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a standard user - for example through phishing, a compromised application, or stolen credentials - runs a crafted program locally that interacts with the Connected User Experiences and Telemetry service to trigger the type-confusion condition. By controlling the mis-typed object, they corrupt the privileged service's memory to execute code as SYSTEM, escalating from a limited account to full control of the host. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50421 (Vendor-released patch: available per the MSRC advisory) as the primary and definitive fix, selecting the cumulative update that matches each affected build; consult the exact KB/fixed-version details at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50421. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an asset inventory to identify all Windows 10 (versions 1607 through 26H1), Windows 11, and Windows Server 2016-2025 systems in scope. …
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External POC / Exploit Code
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