CVE-2026-50339 in Windows
Summary
by MITRE • 07/14/2026
Exposure of sensitive information to an unauthorized actor in Windows Push Notifications allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical privilege escalation vector within the Windows operating system that enables attackers with low-privilege access to potentially extract sensitive information through the Windows Push Notification service. The flaw stems from inadequate access controls and improper privilege validation within the notification subsystem, allowing unauthorized actors to intercept or access data that should remain restricted to authorized processes. The vulnerability specifically affects the Windows Push Notifications component which handles communication between applications and the operating system's notification framework, creating an attack surface where sensitive metadata or content could be exposed to malicious entities with minimal privileges.
The technical implementation of this weakness involves the manipulation of notification channels and registry entries that govern access permissions for push notification services. Attackers can exploit this by leveraging legitimate system interfaces while bypassing expected security boundaries, potentially accessing cached notifications, user data, or system information that applications normally cannot retrieve. This issue aligns with CWE-200 which addresses improper exposure of sensitive information and demonstrates how inadequate privilege separation in system services can lead to information disclosure vulnerabilities. The flaw typically manifests when applications register for push notifications without proper validation of the requesting process's privileges, allowing malicious code to intercept or query notification data that contains sensitive content.
The operational impact extends beyond simple information disclosure as it creates opportunities for attackers to gather intelligence about user activities, application behavior, and potentially system configuration details that could facilitate further exploitation. Attackers might leverage this vulnerability to understand user preferences, identify running applications, or extract metadata that could aid in targeting more sophisticated attacks. This weakness particularly affects enterprise environments where users may have access to sensitive corporate information through push notifications, creating risks for data exfiltration or targeted attacks against specific individuals or systems. The vulnerability operates at the system level and can be exploited by attackers who have already achieved initial compromise through other means, making it a valuable escalation vector in attack chains.
Security mitigations should focus on implementing proper access controls within the Windows notification subsystem and ensuring that privilege validation occurs before allowing data retrieval operations. System administrators should monitor notification service logs for unusual activity patterns and implement application whitelisting to restrict which processes can register for push notifications. The recommended approach includes applying Microsoft security patches promptly, configuring appropriate registry permissions for notification services, and implementing network monitoring to detect anomalous notification traffic patterns. Organizations should also consider implementing the principle of least privilege when configuring notification services, ensuring that only necessary applications have access to sensitive notification data. This vulnerability demonstrates how seemingly benign system components can become attack vectors when proper security boundaries are not maintained, requiring comprehensive security reviews of all operating system services and their interaction with user processes. The weakness highlights the importance of maintaining strict separation between system services and user applications in Windows environments, particularly within the notification framework where sensitive information flows through well-defined but potentially vulnerable interfaces.