EUVD-2026-43839
GHSA-jmvx-6p58-9955
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated attacker (AV:L, PR:L) with no user interaction; high complexity reflects a likely race condition, and successful EoP grants full SYSTEM control (C/I/A:H).
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
Improper access control in Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Win32K kernel-mode subsystem lets an already-authenticated local user gain SYSTEM-level control across a broad range of Windows client and server releases (Windows 10 1607 through Windows 11 26H1, and Windows Server 2012 through Server 2025). Rooted in improper access control (CWE-284), successful exploitation yields full confidentiality, integrity, and availability impact on the host. …
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 | Exploitation requires an existing authenticated local presence on the target: the CVSS vector's PR:L confirms the attacker must already hold low-level privileges (a valid standard user account or equivalent code execution context), and AV:L confirms local access rather than remote/network reach. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals point to a real but not top-tier emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged authenticated session on a Windows host - for example a standard domain user on a shared terminal server, or a foothold gained through phishing or a separate app compromise - invokes a crafted sequence of Win32K system calls to abuse the improper access control and elevate to SYSTEM. The high attack complexity (AC:H) means the attacker may need to win a race or hit specific state, so exploitation may require multiple attempts, and no public exploit code is currently identified. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50325 via the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50325, selecting the cumulative update matching each affected build (Windows 10 1607/1809/21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2012 through 2025 including Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory Windows 11 and Windows Server 2025 systems and begin testing the vendor patch in a staging environment; implement temporary restrictions on local administrative account usage. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
More in Windows 10 Version 1607
View allLocal privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
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
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
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
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-284 – Improper Access Control
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today