EUVD-2026-43930
GHSA-r5j4-w8vq-j3cp
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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already possess a local, authenticated low-privileged account on the target (CVSS PR:L, AV:L), from which code is run against the Windows Filtering Platform interface; no user interaction is needed (UI:N) and attack complexity is low (AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (base 7.8, High) describes a low-complexity local attack requiring an existing low-privileged foothold and no user interaction, yielding full compromise of confidentiality, integrity, and availability - the classic elevation-of-privilege profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a standard low-privileged user session - via phishing, a compromised service account, or an earlier remote bug - runs a crafted local process that abuses WFP's overly permissive access control to escalate to SYSTEM. Given the low attack complexity and no user-interaction requirement, this makes a reliable post-exploitation step, though no public exploit code has been identified in the provided data. |
| Remediation | 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). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an immediate inventory of all Windows 10, Windows 11, and Windows Server systems (2012 through 2025) across your environment to identify exposure scope and prioritize critical infrastructure. …
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