Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Requires an existing local low-privileged account (AV:L/PR:L), runs without user interaction at low complexity (UI:N/AC:L), and escalation to SYSTEM yields full C/I/A impact within an unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Insufficient granularity of access control in Windows Filtering Platform (WFP) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Filtering Platform (WFP) lets an authenticated low-privileged user gain higher privileges on affected Windows 10, Windows 11, and Windows Server systems (Server 2012 through Server 2025). Rooted in insufficient access-control granularity (CWE-1220), a local attacker with a valid session can manipulate WFP to reach SYSTEM-level access. There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but Microsoft rates the confidentiality, integrity, and availability impact as High.
Technical ContextAI
The Windows Filtering Platform is a core kernel-mode and user-mode framework Microsoft ships in every modern Windows build to implement firewalling, IPsec, and packet inspection; security products and the Windows Firewall itself register filters, callouts, and sublayers through it. The weakness is CWE-1220, Insufficient Granularity of Access Control, meaning WFP grants a permission scope broader than intended, so an operation that should require higher privilege is reachable by a lower-privileged principal. Per the supplied CPE data, the affected components span Windows 10 (1607, 1809, 21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012 through 2025 including Server Core installations, indicating the flawed WFP code is shared across the whole supported Windows codebase rather than a single edition.
RemediationAI
Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50405 as delivered through the applicable monthly cumulative/rollup for each edition, with exact fixed builds listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50405 (the input does not include a single fixed version string, so consult the advisory for the KB matching your specific Windows build). Because this is a local elevation-of-privilege flaw with no vendor workaround supplied, the primary control is installation of the update; in the interim, reduce exposure by enforcing least privilege and limiting interactive/local logon rights so that untrusted or low-privileged users cannot obtain the local foothold the attack requires, and monitor endpoints for unexpected privilege changes - with the trade-off that these are containment measures that lower likelihood but do not remove the underlying WFP access-control defect.
More in Windows 10 Version 1607
View allRemote code execution in Windows IKE Extension (Internet Key Exchange) via double free memory corruption allows unauthen
Local privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Windows Shell protection mechanism failure (CVE-2026-32202) allows remote attackers to perform spoofing attacks over a n
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation via heap-based buffer overflow in the Windows Message Queuing (MSMQ) Queue Manager component
Local privilege escalation in Microsoft Windows Win32K lets an authenticated low-privileged user corrupt kernel heap mem
Local privilege escalation in the Windows NTFS file system driver lets an authenticated low-privileged user win a race c
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Same technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today
EUVD-2026-43930
GHSA-r5j4-w8vq-j3cp