CVE-2026-50498 in Windows
Summary
by MITRE • 07/14/2026
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability resides within the Windows Universal Disk Format File System Driver component that handles UDFS file operations on Windows systems. The flaw represents a privilege escalation weakness that allows malicious actors to elevate their access rights from standard user level to system level privileges. The vulnerability stems from improper input validation and insufficient access control mechanisms within the driver's handling of UDFS file system operations, creating an opportunity for unauthorized code execution with elevated privileges.
The technical implementation of this vulnerability involves a flaw in how the UDFS driver processes specific file system requests and handles memory allocation during disk image operations. When a user performs certain operations on UDFS formatted media or files, the driver fails to properly validate input parameters before executing privileged operations. This oversight enables attackers to craft malicious inputs that trigger buffer overflows or arbitrary code execution within the kernel context of the operating system. The vulnerability specifically manifests when the driver processes malformed UDFS structures during file access operations, allowing for privilege escalation through direct manipulation of kernel memory spaces.
The operational impact of this vulnerability extends across multiple Windows versions including windows 10, windows server 2016, and windows server 2019, making it a widespread concern for enterprise environments. Attackers can exploit this weakness by presenting specially crafted UDFS formatted media or files to unsuspecting users, who then inadvertently trigger the privilege escalation when accessing the content. The vulnerability's exploitation requires minimal user interaction beyond normal file system operations, making it particularly dangerous in targeted attack scenarios. Once successfully exploited, attackers gain complete system control including ability to install software, modify system configurations, and access all user data without detection.
Security professionals should implement immediate mitigations through Windows Update patches provided by Microsoft to address the underlying driver flaw. Network administrators should consider implementing application whitelisting policies that restrict execution of potentially malicious UDFS operations while monitoring for suspicious file system activity. The vulnerability aligns with CWE-121 heap-based buffer overflow and relates to ATT&CK technique T1068 for privilege escalation through kernel exploits. Organizations must also conduct thorough vulnerability assessments to identify systems running outdated UDFS drivers and ensure comprehensive monitoring of system logs for signs of exploitation attempts. Additionally, security teams should implement endpoint detection and response solutions capable of identifying anomalous kernel-level behavior indicative of this specific privilege escalation attack vector.
This vulnerability demonstrates the critical importance of proper input validation in kernel-mode drivers and highlights potential gaps in Windows security model implementation. The flaw represents a significant risk to enterprise security posture given its ability to provide complete system compromise with minimal user interaction required for exploitation. Security teams must maintain vigilance against similar vulnerabilities in other file system drivers and ensure comprehensive patch management processes are in place to address such critical kernel-level flaws promptly.