EUVD-2026-43825
GHSA-v25p-9crm-vx96
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an authenticated low-priv foothold (AV:L/PR:L), high complexity due to race/state prerequisites (AC:H), yielding full SYSTEM compromise (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
Local privilege escalation in the Windows Win32K kernel-mode subsystem allows an already-authenticated low-privileged user to elevate to SYSTEM through an improper access-control flaw. The issue affects a broad range of Windows client and server releases, from Windows 10 1607 and Windows Server 2012 through Windows 11 26H1 and Windows Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local access to the machine with at least low-level privileges (AV:L, PR:L) and the ability to execute code that issues Win32K syscalls; no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H yields a base score of 7.0 (High). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host - for example via phishing, a stolen credential, or a compromised low-trust service account - runs a crafted local program that abuses the Win32K access-control flaw to escalate to SYSTEM. Because exploitation is rated high-complexity (AC:H), the attacker likely needs to win a race condition or manipulate kernel object state, so the exploit may require multiple attempts; no public POC was identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-49805 (Patch available per vendor advisory) via Windows Update or WSUS/SCCM for every affected client and server SKU, prioritizing multi-user systems such as Remote Desktop Session Hosts, VDI, and shared workstations where untrusted users execute code. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, scan the infrastructure to enumerate all Windows 10 (versions 1607 through current), Windows 11 (through 26H1), and Windows Server (2012 through 2025) systems. …
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External POC / Exploit Code
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