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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.8 MEDIUM
cvss
vuln.today AI
7.8 HIGH

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.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 20:36 vuln.today
CVE Published
Jul 14, 2026 - 17:07 nvd
HIGH 7.8

DescriptionCVE.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.

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CVE-2026-50405 vulnerability details – vuln.today

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