Windows Wireless Wide Area Network Service Deserialization Flaw

Executive Summary

CVE-2026-50509 is a vulnerability in the Windows Wireless Wide Area Network Service. It involves the deserialization of untrusted data, which means the service improperly processes data received from an untrusted source.

An authorized attacker with local access to the system can exploit this flaw to elevate their privileges. This could allow them to gain higher-level permissions on the affected system, potentially taking full control.

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Detection Guidance

Detection requires checking for unauthorized privilege escalation attempts in Windows Wireless Wide Area Network Service. Monitor system logs for unusual activity in wwansvc.dll or related processes. Use Windows Event Viewer to inspect Security logs for Event ID 4688 (process creation) with elevated privileges. Check for unexpected changes in service configurations or registry keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WwanSvc.

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Impact Analysis

If you are using a system with the Windows Wireless Wide Area Network Service, this vulnerability could have several impacts:

• An attacker with local access and low privileges could exploit this to gain administrative or SYSTEM-level privileges on your machine.
• Once elevated, the attacker could install malicious software, modify or delete data, or create new accounts with full user rights.
• This could lead to unauthorized access to sensitive information, disruption of services, or further compromise of your network.

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Compliance Impact

This vulnerability could impact compliance with several standards and regulations, depending on the context of your organization:

• GDPR: If the affected system processes personal data of EU citizens, a successful exploit could lead to unauthorized access or disclosure of this data. This may violate GDPR requirements for data protection and breach notification.
• HIPAA: For organizations handling protected health information (PHI), this vulnerability could result in unauthorized access to PHI, violating HIPAA's security and privacy rules.
• Other standards like ISO 27001 or NIST frameworks require organizations to manage vulnerabilities and protect systems from unauthorized access. Failure to patch this vulnerability could result in non-compliance.

To maintain compliance, it is critical to apply security updates promptly and ensure systems are protected against privilege escalation attacks.

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Mitigation Strategies

Apply the security update provided by Microsoft to address CVE-2026-50509. The update can be found in the Microsoft Update Guide for this vulnerability.

• Ensure all systems running the affected Windows Wireless Wide Area Network Service are updated to the latest patched version.
• Restrict local access to trusted users only, as the vulnerability requires local privileges to exploit.
• Monitor Microsoft's security advisories for any additional guidance or updates related to this CVE.

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