EUVD-2026-43900
GHSA-4ffp-3cf5-9hgm
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local low-privileged attacker must win a hard-to-time race (AV:L/PR:L/AC:H) with no user interaction, yielding full SYSTEM compromise (C:H/I:H/A:H) in the same scope (S:U).
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Operating Systems allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 lets an already-authenticated, low-privileged attacker win a race condition (CWE-362) over an improperly synchronized shared resource to elevate privileges. Reported by Microsoft itself, the flaw carries a CVSS 7.0 and per SSVC has total technical impact but is not automatable and shows no observed exploitation; no public exploit is 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 have local, interactive execution on the host with low-level (PR:L) privileges - a standard authenticated user account or code running in a non-privileged context; it cannot be triggered remotely or by an unauthenticated party (AV:L, no network path). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals converge on a genuine-but-not-urgent local escalation issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows 11 or Server 2025 host - for example through phishing-delivered malware or a compromised standard user account - runs code that repeatedly triggers the vulnerable OS operation while a second thread manipulates the shared resource to win the timing window. On a successful race, the attacker gains SYSTEM-level privileges, achieving full confidentiality, integrity, and availability compromise of the machine. … |
| Remediation | Vendor-released patch: apply the Microsoft cumulative security update that brings each platform to at least the fixed build - Windows 11 24H2 to 10.0.26100.8875, Windows 11 25H2 to 10.0.26200.8875, Windows 11 26H1 to 10.0.28000.2269, and Windows Server 2025 (including Server Core) to 10.0.26100.33158 - via Windows Update, WSUS, or your patch-management pipeline, following the specific KB linked from the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50317. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 11 (versions 24H2, 25H2, 26H1) and Windows Server 2025 systems in your environment and verify patch availability from Microsoft advisory. …
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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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