CVE-2026-50502 in Windows
Summary
by MITRE • 07/14/2026
Insufficient granularity of access control in Windows Event Logging Service allows an authorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 07/14/2026
The vulnerability described represents a critical access control weakness within the Windows Event Logging Service that fundamentally undermines the security boundaries of the operating system. This issue stems from inadequate permission controls that permit authenticated users to escalate their privileges and execute arbitrary code remotely, effectively bypassing the intended security model of the event logging infrastructure. The flaw exists at the core of how Windows manages event log access permissions, where the service fails to properly enforce the principle of least privilege for network-based operations.
The technical implementation of this vulnerability lies in the insufficient granularity of access control mechanisms within the Windows Event Logging Service component. When an attacker gains authenticated access to a system running this service, they can leverage the weak permission model to manipulate event log entries and ultimately execute malicious code with elevated privileges. This occurs because the service does not properly validate or restrict network-based operations that should require higher-level permissions. The vulnerability specifically affects how the system handles remote event log operations, where network connections are allowed to bypass normal access control checks that would normally prevent privilege escalation.
From an operational perspective, this vulnerability creates a significant attack surface that enables lateral movement and persistent access within networks. Attackers can exploit this weakness to execute code remotely without requiring physical access or elevated local privileges, making it particularly dangerous in enterprise environments where event logging services are commonly exposed to network traffic. The impact extends beyond simple code execution to include potential data exfiltration, system compromise, and establishment of backdoors. According to the mitre att&ck framework, this vulnerability maps directly to privilege escalation techniques and can be leveraged as part of broader attack chains involving lateral movement and persistence.
The security implications of this flaw align with common weakness enumerations such as cwe-284, which addresses improper access control, and cwe-732, which covers incorrect permission assignment. The vulnerability demonstrates how insufficiently granular access controls can be exploited to achieve unauthorized code execution through legitimate system services. Organizations running Windows systems with event logging enabled are particularly at risk, especially when these services are configured to accept network connections from untrusted networks. The attack vector typically involves establishing a network connection to the event logging service and then exploiting the permission bypass to execute malicious payloads.
Mitigation strategies should focus on implementing proper access control enforcement within the Windows Event Logging Service configuration. Administrators should ensure that network-based event log operations require appropriate authentication and authorization checks, and that remote access is restricted to trusted networks only. The recommended approach includes configuring proper firewall rules, implementing network segmentation, and applying the principle of least privilege for all event logging service accounts. Additionally, regular security assessments should verify that access controls are properly enforced and that no unnecessary network exposure exists for event logging services. Organizations should also consider implementing additional monitoring and alerting mechanisms to detect suspicious event log activities that might indicate exploitation attempts.