EUVD-2026-44238
GHSA-73hr-7mmq-82g4
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated attacker with no interaction (AV:L/PR:L/UI:N/AC:L); an OOB read most credibly yields info disclosure plus EoP-enabled integrity impact, so A:N unless corruption is confirmed.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Windows Win32K - GRFX allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Win32k GRFX subsystem across Windows 10, Windows 11, and Windows Server 2012 through 2025 lets an authenticated low-privileged local attacker elevate to SYSTEM by triggering an out-of-bounds read (CWE-125). The flaw was reported internally by Microsoft, a vendor patch is available via MSRC, and there is no public exploit 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, authenticated access with low privileges on the target Windows system (CVSS PR:L, AV:L) and the ability to run code that reaches the Win32k GRFX graphics subsystem - the standard interactive Windows GDI attack surface, present by default. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U) confirms a local, low-complexity, low-privilege bug with no user interaction - a classic post-compromise privilege-escalation primitive rather than a remote entry point. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has low-privileged code execution on a Windows host - via phishing, a compromised service account, or a malicious insider - runs a crafted program that invokes the vulnerable Win32k GRFX codepath to trigger the out-of-bounds read and elevate to SYSTEM, with no user interaction required. No public proof-of-concept is identified at time of analysis, but Win32k elevation-of-privilege flaws are a well-known target for chaining after initial access. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-56176 from the MSRC update guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56176), selecting the correct package for each affected SKU across Windows 10, Windows 11, and Windows Server 2012-2025 including Server Core; take the exact fixed build numbers from that advisory rather than assuming them. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows systems to identify instances of Windows 10, 11, and Server 2012 through 2025 and determine exposure scope. …
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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