UDFS Driver Elevation of Privilege Vulnerability

Executive Summary

CVE-2026-50498 is an elevation of privilege vulnerability in the Windows Universal Disk Format File System Driver (UDFS). This vulnerability allows an attacker to gain higher-level permissions on a system than they are authorized to have.

The vulnerability is classified with a CVSS v3.1 base score of 7.8, indicating a high severity. The vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H means the attack requires local access (AV:L), low attack complexity (AC:L), no privileges required (PR:N), but user interaction is needed (UI:R). It can result in high impacts on confidentiality, integrity, and availability (C:H/I:H/A:H).

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying the presence of CVE-2026-50498 on a network or system. Detection typically involves checking for vulnerable versions of the Windows Universal Disk Format File System Driver (UDFS) or applying security updates provided by Microsoft.

To determine if your system is vulnerable, you may check the installed updates or patches related to this CVE via Windows Update or the Microsoft Update Catalog. However, no direct commands or tools are mentioned in the provided resources.

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Impact Analysis

If exploited, this vulnerability could allow an attacker to elevate their privileges on a Windows system running the affected Universal Disk Format File System Driver (UDFS).

• An attacker with local access to the system could execute arbitrary code with elevated privileges, potentially taking full control of the affected system.
• This could lead to unauthorized access to sensitive data, installation of malware, or disruption of system operations.

The vulnerability is rated as Important in severity, meaning it poses a significant risk if exploited.

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Compliance Impact

This vulnerability could impact compliance with standards and regulations in the following ways:

• GDPR: If the vulnerability leads to unauthorized access to personal data, it could result in a breach of GDPR requirements for data protection and privacy. Organizations may face fines or penalties if they fail to mitigate the risk.
• HIPAA: For organizations handling protected health information (PHI), exploitation of this vulnerability could lead to unauthorized access or disclosure of PHI, violating HIPAA's security and privacy rules.
• Other standards (e.g., ISO 27001, NIST): Failure to address this vulnerability could result in non-compliance with requirements for access control, system integrity, and risk management.

Organizations should apply the necessary patches or mitigations to avoid potential compliance violations.

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Mitigation Strategies

To mitigate CVE-2026-50498, apply the security update provided by Microsoft as soon as possible. The update addresses the elevation of privilege vulnerability in the Windows Universal Disk Format File System Driver (UDFS).

• Visit the Microsoft Security Response Center (MSRC) update guide for CVE-2026-50498 to download and install the latest patch.
• Ensure all Windows systems are up to date with the latest security updates via Windows Update or your organization's patch management system.
• Monitor the MSRC portal for any additional guidance or mitigations related to this vulnerability.

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