EUVD-2026-56287
GHSA-33m6-hpxx-phxq
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L and PR:L confirmed by 'authorized attacker, locally'; AC:H reflects heap exploitation timing/layout prerequisites; full CIA from SYSTEM access; S:U as escalation stays within the same OS instance.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows LUAFV allows an authorized attacker to elevate privileges locally.
AnalysisAI
Heap-based buffer overflow in the Windows LUAFV (Layered User Access Filter Volume) kernel driver enables a locally authenticated, low-privileged user to escalate to full SYSTEM-level privileges across a wide range of Windows desktop and server releases. Microsoft has released patches covering Windows 10 through Windows 11 and Windows Server 2012 through Server 2025, with exact fix builds published via MSRC and ENISA EUVD-2026-56287. No public exploit code has been identified at time of analysis and the vulnerability is not listed in the CISA KEV catalog, though the AC:H constraint limits opportunistic exploitation rather than eliminating risk from determined actors who already hold a foothold.
Technical ContextAI
LUAFV (Layered User Access Filter Volume) is a kernel-mode filter driver built into Windows that implements UAC file system virtualization - it transparently redirects write operations from legacy applications that lack administrator privileges to per-user virtual store locations, preventing permission errors without requiring elevation. CWE-122 (Heap-based Buffer Overflow) identifies the root cause class: insufficient bounds checking on a heap-allocated buffer within this driver allows an attacker to write past the buffer's intended boundary, potentially corrupting adjacent heap metadata, kernel data structures, or function pointers. Kernel heap corruption of this type is a well-understood exploitation class that, when conditions align, can be leveraged to overwrite privilege-enforcement structures and achieve arbitrary code execution in kernel context. Affected products span the entire modern Windows ecosystem from Server 2012 (build 6.2.9200.x) through Windows 11 26H1 (build 10.0.28000.x) and Windows Server 2025, indicating that the vulnerable code path has persisted across roughly 14 years of Windows releases.
RemediationAI
Apply the Microsoft security update resolving CVE-2026-50472, distributed via Windows Update, WSUS, or Microsoft Update Catalog. Exact minimum patched builds confirmed by EUVD data are: Windows 10 1607 and Server 2016 → 10.0.14393.9418; Windows 10 1809 and Server 2019 → 10.0.17763.9115; Windows 10 21H2 → 10.0.19044.7663; Windows 10 22H2 → 10.0.19045.7663; Windows 11 23H2 → 10.0.22631.7517; Windows 11 24H2 and Server 2025 → 10.0.26100.9168 (Server 2025 requires 10.0.26100.33296); Windows 11 25H2 → 10.0.26200.9168; Windows 11 26H1 → 10.0.28000.2704; Server 2022 → 10.0.20348.5499; Server 2012 R2 → 6.3.9600.23337; Server 2012 → 6.2.9200.26279. The MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50472 is the authoritative source for patch packages. Microsoft has not published an official workaround; theoretically disabling UAC file virtualization via registry would reduce LUAFV driver activity, but this would break legacy application compatibility in unpredictable ways and is not recommended in production without extensive testing. Patching remains the only reliable remediation.
More in Windows 10 1607
View allWindows MSHTML component contains a remote code execution vulnerability that allows attackers to craft malicious ActiveX
<p>A remote code execution vulnerability exists when the Windows Print Spooler service improperly performs privileged fi
Windows MSDT (Microsoft Support Diagnostic Tool) allows remote code execution when called via the ms-msdt URL protocol f
The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows
The Windows VBScript engine contains a remote code execution vulnerability in object handling that allows full system co
Windows Print Spooler Remote Code Execution Vulnerability. Rated high severity (CVSS 7.8), this vulnerability is no auth
The Win32k kernel-mode driver in Windows Vista through Windows Server 2016 allows local privilege escalation, exploited
Windows Search Remote Code Execution Vulnerability. Rated high severity (CVSS 7.5), this vulnerability is remotely explo
Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour
Windows Kernel contains a TOCTOU race condition vulnerability allowing local privilege escalation, exploited by the OilR
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in
Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
View allShare
External POC / Exploit Code
Leaving vuln.today