EUVD-2026-43884
GHSA-j8c3-8q9j-mhwh
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local session with low privileges required; scope unchanged; only confidentiality impacted with no integrity or availability effect.
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
Sensitive information disclosure in Windows Push Notifications (WPN) permits a locally authenticated, low-privileged attacker to read confidential data they are not authorized to access. Affected systems span Windows 10 (1809 through 22H2), Windows 11 (24H2 through 26H1), Windows Server 2019, 2022, and 2025, covering a broad enterprise and consumer footprint. No public exploit identified at time of analysis, EPSS sits at 0.36% (28th percentile), and CISA SSVC rates exploitation as none with non-automatable attack paths.
Technical ContextAI
Windows Push Notifications (WPN) is an OS-level service on Windows that manages delivery of application and system notifications. The root cause is classified as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor), indicating the WPN subsystem fails to enforce proper access controls on sensitive data it handles or exposes through its API or inter-process communication surface. Because the attack vector is local (AV:L) and requires only low privileges (PR:L), the flaw likely resides in a named pipe, shared memory segment, registry key, notification content store, or IPC mechanism accessible to standard user accounts. Affected CPEs span cpe:2.3:a:microsoft:windows_10_version_1809 through cpe:2.3:a:microsoft:windows_server_2025, indicating the vulnerable WPN code is shared across the modern Windows codebase dating at least to the 1809 release.
RemediationAI
The primary fix is applying the vendor-released patch via Windows Update or WSUS targeting the build versions listed in the EUVD data: Windows 10 1809 and Server 2019 should reach 10.0.17763.9020 or later; Windows 10 21H2 should reach 10.0.19044.7548; Windows 10 22H2 should reach 10.0.19045.7548; Windows 11 24H2 should reach 10.0.26100.8875; Windows 11 25H2 should reach 10.0.26200.8875; Windows 11 26H1 should reach 10.0.28000.2269; Windows Server 2022 should reach 10.0.20348.5386; and Windows Server 2025 should reach 10.0.26100.33158. The Microsoft MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50339 is the authoritative source for patch details. As a compensating control in environments where immediate patching is not possible, restricting interactive local logon rights to only trusted administrative accounts reduces the attacker pool, though this may impact legitimate user workflows. Disabling or restricting WPN via Group Policy (Computer Configuration > Administrative Templates > Start Menu and Taskbar > Notifications) would prevent notifications from functioning but eliminates the WPN attack surface entirely on sensitive server workloads where notifications are not operationally required.
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External POC / Exploit Code
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