EUVD-2026-43791
GHSA-gr87-xh8q-83qf
Severity by source
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Local EoP needing an authenticated user (PR:L) and a hard-to-win race (AC:H); privileged code execution yields full C/I/A and a changed scope (S:C).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Push Notifications component (WPN) affects Windows 11 (23H2, 24H2, 25H2, 26H1) and Windows Server 2025 including Server Core, where a race condition (CWE-362) lets an authorized local user win a timing window on a shared resource to run code at a higher privilege level. Microsoft reported the issue and has released a patch; 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 an existing authenticated local foothold (CVSS PR:L) on an affected build - Windows 11 23H2/24H2/25H2/26H1 or Windows Server 2025 - and the ability to execute code locally to drive the Windows Push Notifications subsystem; it cannot be triggered remotely (AV:L) and needs no user interaction (UI:N). … 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:H/PR:L/UI:N/S:C/C:H/I:H/A:H - local attack vector, high attack complexity, low privileges required, no user interaction, changed scope and high confidentiality/integrity/availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a low-privileged authenticated session on a Windows 11 or Windows Server 2025 host runs a local program that repeatedly triggers Push Notification operations while racing a second thread to manipulate the shared resource during the unsynchronized window. On a successful timing win, the operation executes in a higher-privileged context, giving the attacker SYSTEM-level code execution and crossing the security scope boundary. … |
| Remediation | Apply the Microsoft security update for the affected SKU as the primary fix - a vendor patch is available per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-44800; deploy the corresponding monthly cumulative update for Windows 11 (23H2/24H2/25H2/26H1) or Windows Server 2025 (including Server Core) via Windows Update, WSUS, or your patch-management pipeline, and reboot to complete servicing. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows Server 2025 and Windows 11 systems running affected versions, prioritizing production servers. …
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Same weakness CWE-362 – Race Condition
View allSame technique Race Condition
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External POC / Exploit Code
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