Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local EoP requiring an existing low-privileged foothold (AV:L, PR:L), no user interaction, and a kernel UAF yielding full SYSTEM-level C/I/A impact within unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel lets an authenticated attacker who already has low-privileged code execution on a host elevate to SYSTEM by exploiting a use-after-free (CWE-416) memory corruption. It affects a broad range of supported Windows client and server builds - Windows 10 (1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2019/2022/2025 - and Microsoft has released a patch. …
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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, low-privileged access to the target Windows host (CVSS PR:L, AV:L) - this is a post-compromise elevation primitive, not a remote entry point, so a prior foothold (valid credentials, an existing malware/agent, or another initial-access vulnerability) is the key prerequisite and the primary limiting factor. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.8 (High) with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - local attack vector, low complexity, low privileges required, no user interaction, and full confidentiality/integrity/availability impact within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker first obtains ordinary low-privileged code execution on a Windows host - for example via a phishing payload, a compromised standard user account, or a foothold from another exploited application. They then run a crafted program that triggers the kernel use-after-free, grooms the kernel pool to reclaim the freed object with attacker-controlled data, and escalates to SYSTEM to disable security tooling, install persistence, or move laterally. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50478 for your specific Windows SKU and build via Windows Update or WSUS; the patch is available per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50478 (Patch available per vendor advisory - consult the MSRC page for the exact KB/build number for each affected version). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (versions 1809, 21H2, 22H2), Windows 11 (versions 24H2, 25H2, 26H1), and Windows Server (2019, 2022, 2025) systems in production, prioritizing servers handling sensitive data and administrative workstations. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44087
GHSA-2vx4-34hr-q4wv