EUVD-2026-43853
GHSA-j5rm-m6wv-77vq
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation requiring a low-privileged foothold (AV:L/PR:L) with no user interaction; successful exploitation yields SYSTEM control, giving full C/I/A impact.
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 Push Notifications allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Push Notifications component (WNS/WpnService) lets an already-authenticated low-privileged user overwrite adjacent heap memory to gain SYSTEM-level control across Windows 10 (1607-22H2), Windows 11 (24H2-26H1), and Windows Server 2012 R2 through 2025. Microsoft reported the flaw and has shipped a fix; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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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 access to the target host at a low privilege level (CVSS PR:L) and the ability to execute code that interacts with the Windows Push Notification service; no user interaction is needed (UI:N) and the attack is local only (AV:L), so it cannot be launched remotely over the network. … 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, 7.8 High) describes a reliable local elevation: an attacker needs low privileges and local access but no user interaction, and complexity is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged foothold on a Windows host - for example via phishing, a compromised standard user account, or a low-integrity application - sends crafted notification data to the Windows Push Notifications service to trigger the heap overflow, corrupting memory in the higher-privileged service and elevating to SYSTEM. Given AV:L/AC:L, exploitation is local and low-complexity, making it an attractive second-stage escalation primitive; no public exploit code has been identified at time of analysis. |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50363 (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50363), selecting the cumulative update that matches each affected build; the input confirms a patch is available from the vendor but does not enumerate exact KB or build numbers, so pull the precise fixed version per OS from the MSRC guide. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 10, 11, and Server 2012 R2-2025 systems in your environment and begin patch testing in a non-production environment; validate Microsoft's available patch for WpnService compatibility with your deployment infrastructure. …
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External POC / Exploit Code
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