CVE-2026-96311 in Windows
Summary
by MITRE • 10/15/2026
Improper authorization in Windows Network List Service allows an authorized attacker to perform tampering locally.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified within the Microsoft Windows Network List Service represents a critical flaw in access control mechanisms, specifically categorized under CWE-269: Improper Control of Interaction Between Multiple Privileged Entities. This service is responsible for managing network connectivity status and profile assignments on Windows operating systems, determining whether a connection should be treated as public or private based on user-defined policies. The core technical issue stems from an improper authorization check that allows an authenticated attacker to manipulate the state of this service without sufficient privilege escalation requirements. While the prompt specifies that the attacker must be authorized, meaning they possess valid credentials and some level of local access, the flaw lies in the fact that these existing privileges are insufficiently restricted for specific administrative operations related to network profile management. This misconfiguration effectively bypasses intended security boundaries, allowing a user with standard or even limited elevated permissions to alter system-wide network configuration states.
From an operational perspective, this vulnerability enables local tampering of network profiles, which can have significant implications for endpoint security posture and organizational policy enforcement. By altering the classification of a network connection from private to public or vice versa, an attacker can inadvertently or intentionally disable specific firewall rules that are tied to those profile types. For instance, if an organization enforces strict inbound traffic restrictions on public networks but allows broader access on private trusted networks, manipulating this setting could expose internal services to unauthorized external connections. Furthermore, such tampering can disrupt network discovery features and shared resource accessibility, leading to denial of service conditions for legitimate users relying on file sharing or printer availability within a corporate domain environment. The ability to modify these settings locally undermines the integrity of centralized security policies managed by tools like Group Policy Objects (GPO) or Microsoft Endpoint Configuration Manager, as local overrides can take precedence depending on specific system configurations and timing.
In terms of threat modeling and adversary behavior, this vulnerability aligns with techniques observed in the MITRE ATT&CK framework, particularly under T1562: Impair Defenses. Attackers often seek to disable or modify security software and monitoring mechanisms to maintain persistence and evade detection. By manipulating network profiles, an attacker can effectively impair defensive controls that rely on accurate network context for rule application. This action facilitates lateral movement by potentially opening ports that were previously closed due to public profile restrictions, thereby expanding the attack surface available for subsequent exploitation phases such as credential dumping or remote code execution via SMB or other local services. The lack of robust authorization checks means that once an attacker gains a foothold on the system through phishing or exploit delivery, they can quickly pivot their capabilities from initial access to broader network manipulation without needing higher-level administrative credentials immediately.
Mitigation strategies for this vulnerability primarily involve ensuring that all systems are updated with the latest security patches released by Microsoft, as these updates typically include fixes for improper authorization checks within core Windows services. Administrators should also enforce strict least-privilege principles across user accounts to minimize the number of users who possess local administrative rights or elevated privileges on workstations and servers. Implementing application control policies using tools like AppLocker or Windows Defender Application Control can prevent unauthorized executables from modifying system settings, even if an attacker gains initial access. Additionally, monitoring for unusual changes in network profile configurations through endpoint detection and response (EDR) solutions can help identify potential exploitation attempts in real time. Regular auditing of local security policies and ensuring that Group Policy restrictions on network profile modifications are strictly enforced further reduces the risk associated with this type of authorization bypass.