CVE-2026-50697 in Windows
Summary
by MITRE • 07/14/2026
Exposure of sensitive information to an unauthorized actor in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
The vulnerability described represents a critical privilege escalation flaw within the Windows Common Log File System Driver component that enables authenticated attackers to access sensitive system information and subsequently elevate their privileges locally. This issue stems from improper access controls and insufficient validation mechanisms within the driver's implementation, creating a pathway for malicious actors who already possess user-level credentials to exploit the system. The vulnerability specifically affects the common log file system functionality that handles logging operations across various Windows components, making it a fundamental building block for system monitoring and diagnostics.
The technical flaw manifests through inadequate privilege checking mechanisms within the driver's handling of log file operations and system resource access. When legitimate users interact with the common log file system, the driver fails to properly validate whether the requesting process has appropriate authorization levels for accessing certain sensitive information or performing elevated operations. This weakness aligns with CWE-284 which addresses inadequate access control mechanisms, and specifically relates to improper privileges in kernel-mode drivers that should enforce strict security boundaries between user and system contexts. The vulnerability essentially allows an attacker to bypass normal access restrictions that would typically prevent local users from reading protected system data or executing privileged operations.
Operationally, this vulnerability presents a significant risk to Windows systems as it enables lateral movement and escalation within compromised environments. Once an attacker gains initial access through any means, they can leverage this privilege escalation flaw to obtain higher-level system privileges without requiring additional authentication mechanisms or complex attack vectors. The impact extends beyond simple information disclosure since the ability to elevate privileges locally creates opportunities for persistent access, data exfiltration, and further exploitation of other system components. Attackers can utilize this vulnerability to establish footholds that remain undetected by standard security monitoring systems while gaining access to sensitive system information such as credential caches, registry keys containing authentication data, or other privileged resources.
Mitigation strategies should include immediate deployment of Microsoft security patches that address the specific driver implementation flaws and proper access control enforcement. System administrators must ensure that Windows updates are applied promptly across all affected systems, particularly in enterprise environments where multiple machines may be vulnerable to similar exploitation patterns. Additional protective measures include implementing strict user account controls through microsoft's least privilege principles, disabling unnecessary logging services where possible, and monitoring for unusual system activity related to log file operations. Organizations should also consider applying the principle of least privilege to log file access permissions and ensure that only authorized processes can interact with the common log file system driver. The vulnerability demonstrates the importance of kernel-mode security testing and proper privilege validation in system drivers, aligning with ATT&CK technique T1068 which covers privilege escalation through kernel exploits and driver vulnerabilities.