EUVD-2026-43896
GHSA-j6fw-387g-rw6j
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 non-deterministic race (AC:H) with no user interaction, yielding full C/I/A impact from the resulting privilege elevation.
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 Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025, where a race condition (CWE-362) in the handling of a shared resource allows an already-authenticated low-privileged attacker to win a timing window and elevate to higher privileges. Exploitation requires winning a non-deterministic race (AC:H) and low-level access to the target host (PR:L, AV:L), and there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already have local, authenticated low-privileged access to the affected host (AV:L, PR:L) - this cannot be triggered remotely or by an unauthenticated user, and no user interaction by a victim is required (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.0 High) describes a locally-exploitable, already-authenticated attack whose realism is tempered by high attack complexity - the attacker must reliably win a race condition, which is non-deterministic and often requires many attempts. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A low-privileged user (or malware already running as a standard user) on a Windows 11 24H2/25H2/26H1 or Windows Server 2025 host repeatedly invokes the vulnerable WinRT code path while a second thread manipulates the shared resource, racing to land inside the unsynchronized window. On a successful race the attacker corrupts privileged state and elevates to SYSTEM-level privileges. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50322 via Windows Update / WSUS / your normal Patch Tuesday process to all Windows 11 24H2, 25H2, 26H1 and Windows Server 2025 (including Server Core) systems; the exact fixed build is listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50322 (no specific fix build number was provided in this dataset, so pull it from the advisory rather than assuming). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, confirm which Windows 11 and Server 2025 systems are deployed and assess single-user versus multi-user deployments; note that exploitation requires local authenticated access and does not represent a network-based threat vector (no public exploit identified at time of analysis). …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 11 Version 24H2
View allLocal privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local privilege escalation in the Windows Kernel lets an already-authenticated attacker corrupt kernel memory via a use-
Local privilege escalation in the Windows Win32K kernel subsystem (CWE-122 heap-based buffer overflow) lets an already-a
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Local code execution in the Microsoft Message Queuing (MSMQ) Queue Manager affects a broad range of Windows client and s
Elevation of privilege in the Windows NTFS file-system driver lets an already-authenticated local user escalate to SYSTE
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation in the Microsoft Windows Kernel allows an already-authenticated attacker to elevate to SYSTEM
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in the Windows Server Network driver stems from a race condition (CWE-362) that lets an unauthoriz
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Remote code execution in Microsoft Windows Message Queuing (MSMQ) allows an unauthenticated attacker to run arbitrary co
Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
View allShare
External POC / Exploit Code
Leaving vuln.today