Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel EoP requiring prior low-privileged code execution (AV:L, PR:L), no user interaction, low complexity, yielding full SYSTEM-level 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
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Kernel lets an already-authenticated attacker corrupt heap memory to gain SYSTEM-level control across Windows 10 (1809/21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2019/2022/2025. The CVSS 7.8 (AV:L/PR:L) rating reflects that low-privileged code execution is a prerequisite; there is no public exploit identified at time of analysis, but 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 code-execution on the target Windows host (CVSS PR:L, AV:L) - this is a privilege-escalation bug, not a remote entry point, so it must be chained after some initial access such as a phished payload, malicious insider, or a low-privileged service account. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U, C:H/I:H/A:H) describes a locally exploitable, low-complexity, low-privilege escalation with full confidentiality/integrity/availability impact - the standard high-value profile for kernel EoP bugs, which are routinely chained after phishing or commodity malware to move from a user context to SYSTEM. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privileged foothold - for example through a phishing payload or stolen standard-user credentials - runs a crafted program that triggers the heap overflow in the vulnerable kernel routine, corrupting adjacent pool memory to hijack kernel execution and elevate to SYSTEM. From there they disable security tooling, harvest credentials, and pivot laterally. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50484 via the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50484 (Patch available per vendor advisory); deploy the cumulative update corresponding to each affected build through Windows Update, WSUS, or your patch-management tooling and reboot to load the fixed kernel. … 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 (24H2/25H2/26H1), and Windows Server 2019/2022/2025 systems to establish exposure scope. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-44093
GHSA-39h3-xp4v-mc8c