Windows Push Notifications Information Disclosure

Executive Summary

CVE-2026-50434 is an information disclosure vulnerability in Windows Push Notifications. It allows an authorized attacker with local access to expose sensitive information to an unauthorized actor.

The vulnerability is classified with a CVSS v3.1 BaseScore of 5.5, indicating a medium severity. The vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N means the attack requires local access (AV:L), low attack complexity (AC:L), low privileges (PR:L), no user interaction (UI:N), and has a high impact on confidentiality (C:H) but no impact on integrity or availability.

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying this vulnerability on a network or system. Detection may require checking Windows Push Notifications configurations or logs for unauthorized access to sensitive information, but no explicit guidance is available in the given resources.

For precise detection steps, refer to Microsoft's official documentation or security advisories, as they may provide updated tools or scripts for identifying this issue.

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Impact Analysis

If exploited, this vulnerability could allow an attacker with local access to your system to disclose sensitive information stored or processed by Windows Push Notifications.

The impact is limited to information disclosure, meaning the attacker could gain access to confidential data but would not be able to modify or delete it. Since the attack requires local access, the risk is higher in environments where multiple users share the same system or where physical security is weak.

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Compliance Impact

This vulnerability could potentially affect compliance with data protection regulations depending on the nature of the exposed information.

• GDPR: If the disclosed information includes personal data of EU citizens, this could be considered a breach of confidentiality, leading to non-compliance with GDPR requirements for data protection and breach notification.
• HIPAA: If the exposed data includes protected health information (PHI), this could violate HIPAA's Privacy Rule, which requires safeguards to protect the confidentiality of PHI.

Organizations subject to these regulations should assess whether the vulnerability could lead to unauthorized access to regulated data and take appropriate mitigation steps to maintain compliance.

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Mitigation Strategies

I don't know

The provided context does not specify immediate mitigation steps for CVE-2026-50434. Typically, for Microsoft vulnerabilities, applying the latest security updates or patches is recommended. Check the linked Microsoft resource for official guidance.

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