EUVD-2026-43919
GHSA-w3hg-m9hj-8hr8
Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable with no auth or interaction (AV:N/PR:N/UI:N) but AC:H because a race window must be won; authentication bypass yields full C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:H/PR:N/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 unauthorized attacker to elevate privileges over a network.
AnalysisAI
Elevation of privilege in Microsoft Windows Runtime (WinRT) lets a remote, unauthenticated attacker win a timing window in a shared-resource race condition and gain higher privileges across a broad range of Windows client and server releases (Windows 10 1809 through Windows 11 26H1 and Windows Server 2019/2022/2025). Microsoft-reported and patched, the flaw carries CVSS 8.1, driven by full confidentiality, integrity, and availability impact but tempered by high attack complexity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the affected Windows Runtime code path on an unpatched host (AV:N) and, critically, the attacker must reliably win a race condition - repeatedly triggering concurrent access to the shared resource to hit the narrow unsynchronized timing window (reflected in AC:H). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H yields 8.1 (High): network reachable (AV:N), no privileges (PR:N) and no user interaction (UI:N) required, but high attack complexity (AC:H) because the attacker must reliably win a race condition - a timing-dependent condition that resists opportunistic mass exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker with network reachability to an unpatched Windows host repeatedly and concurrently invokes the affected Windows Runtime code path, racing to hit the narrow unsynchronized window between an authorization check and the protected operation. On a successful race the attacker bypasses the authentication/privilege check and executes with elevated privileges, gaining full control over the target. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50460 via Windows Update or WSUS/SCCM; a vendor patch is available and Microsoft publishes the exact fixed build per affected SKU in its advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50460 - apply the KB matching each Windows 10/11 or Windows Server 2019/2022/2025 release, including Server Core hosts. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems running Windows 10 1809 and later, Windows 11 through 26H1, or Windows Server 2019, 2022, or 2025 to identify affected assets. …
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External POC / Exploit Code
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