EUVD-2026-43885
GHSA-q68p-x5fp-v8qm
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local access with a low-privileged account is sufficient; confidentiality impact is high given potential for cross-session sensitive data exposure, but no integrity or availability impact applies.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Exposure of sensitive information to an unauthorized actor in Windows Push Notifications allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Push Notifications on multiple Windows 10, 11, and Server editions exposes sensitive information to low-privileged local attackers, who can read notification content or related data scoped to other users or higher-privilege contexts without any user interaction. Affected platforms span Windows 10 1607 through Windows 11 26H1 and Windows Server 2016 through 2025, with vendor-confirmed fixed build versions available via Microsoft Update. No public exploit exists and no active exploitation is confirmed - SSVC rates exploitation as none and EPSS sits at 0.36% (28th percentile) - making this a secondary patching priority unless operating shared multi-user Windows environments.
Technical ContextAI
The Windows Push Notifications subsystem (WPN) delivers real-time alert payloads to applications across user sessions, relying on inter-process communication channels and shared data stores managed by the Windows Notification Platform service. CWE-200 (Exposure of Sensitive Information to Unauthorized Actor) as root cause indicates that access controls on notification content, metadata, or associated IPC endpoints are insufficiently enforced, permitting a low-privileged process to read data intended for a different user context or higher-privilege component. CPE strings confirm the flaw spans all major Windows editions: Windows 10 versions 1607, 1809, 21H2, and 22H2; Windows 11 versions 24H2, 25H2, and 26H1; and Windows Server 2016, 2019, 2022, and 2025 (including Server Core installations), covering their base builds up to the EUVD-confirmed fixed build thresholds.
RemediationAI
Apply the Microsoft-released patch for CVE-2026-50430 via Windows Update or the Microsoft Update Catalog, targeting the following fixed builds: Windows 10 1607 and Server 2016 to build 10.0.14393.9339 or later; Windows 10 1809 and Server 2019 to 10.0.17763.9020 or later; Windows 10 21H2 to 10.0.19044.7548 or later; Windows 10 22H2 to 10.0.19045.7548 or later; Windows 11 24H2 to 10.0.26100.8875 or later; Windows 11 25H2 to 10.0.26200.8875 or later; Windows 11 26H1 to 10.0.28000.2269 or later; Server 2022 to 10.0.20348.5386 or later; Server 2025 to 10.0.26100.33158 or later. The authoritative advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50430. If immediate patching is not possible on shared-session hosts (e.g., RDS servers), a compensating control is to restrict application access to the Push Notifications platform using Windows Defender Application Control (WDAC) or AppLocker policies that limit which processes can register notification channels - note this will suppress legitimate app notifications and may impact business workflows, so test carefully before deploying broadly.
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today