EUVD-2026-44110
GHSA-f892-ww2f-8858
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated user (AV:L/PR:L) must win a narrow timing window (AC:H) with no interaction; successful escalation yields full host C/I/A impact within unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Runtime (WinRT) affects current Microsoft platforms including Windows 11 24H2, 25H2, 26H1, and Windows Server 2025, where a race condition (CWE-362) in the handling of a shared resource lets an already-authenticated local user win a timing window to gain higher privileges. Microsoft has released a patch, and there is no public exploit identified at time of analysis. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess valid local, authenticated access to the target (CVSS PR:L) and the ability to execute code on the host; it cannot be triggered remotely or unauthenticated (AV:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are internally consistent and point to a moderate, escalation-class risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a standard, non-administrative foothold on a Windows 11 or Server 2025 host - for example via phishing or a compromised low-privilege service account - runs a purpose-built tool that repeatedly races the vulnerable Windows Runtime operation to hit the narrow synchronization window. On a successful interleaving, the attacker's code executes with elevated privileges, enabling full compromise of the host. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50503 via the standard Windows Update / WSUS / Microsoft Update Catalog channels for each affected platform (Windows 11 24H2/25H2/26H1 and Windows Server 2025 including Server Core), referencing https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50503 for the exact KB and fixed build number. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, catalog all Windows 11 and Server 2025 deployments across the organization and assess patch readiness, prioritizing administrative workstations and infrastructure servers. …
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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