CVE-2026-50526
Summary
by MITRE • 07/14/2026
Improper link resolution before file access ('link following') in .NET allows an authorized attacker to perform tampering locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability represents a critical security flaw in the .NET framework's handling of symbolic links and file system operations, classified under CWE-382. The issue arises when applications fail to properly resolve symbolic links before performing file access operations, creating opportunities for unauthorized manipulation of file paths and content. An authorized attacker with local access can exploit this weakness by crafting malicious symbolic links that point to sensitive files or directories, effectively bypassing intended access controls and authorization mechanisms.
The technical implementation of this vulnerability stems from the improper handling of file system object resolution within .NET applications. When a program attempts to access a file through a symbolic link, the system should resolve the link to its target path before proceeding with validation checks and access operations. However, in affected implementations, the application may process the symbolic link itself rather than following it to the actual destination, allowing attackers to manipulate which files are actually accessed during the operation. This behavior creates a pathway for attackers to redirect file operations to unintended locations, potentially accessing restricted resources or modifying critical system files.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it enables various attack vectors including privilege escalation, data tampering, and information disclosure. Attackers can leverage this weakness to perform local file system manipulation by creating symbolic links that point to protected configuration files, system binaries, or user data. The vulnerability is particularly concerning in environments where .NET applications handle sensitive operations such as authentication processes, configuration management, or data processing workflows. Organizations may experience unauthorized modifications to critical system components, leading to potential service disruption, data compromise, or system instability.
Mitigation strategies should focus on implementing proper symbolic link resolution mechanisms within .NET applications and establishing robust file access controls. Developers must ensure that all file operations validate the actual target of symbolic links before proceeding with access attempts, utilizing proper path resolution functions and maintaining strict access control policies. System administrators should implement monitoring solutions to detect unusual symbolic link creation patterns and establish regular security audits of file system permissions. The vulnerability aligns with ATT&CK technique T1059.001 for executing commands and T1078 for valid accounts, as it leverages legitimate user privileges to perform unauthorized operations through path manipulation. Organizations should also consider implementing least privilege principles for file system access and ensuring that .NET applications are updated with the latest security patches from Microsoft, which address this specific link resolution vulnerability in the framework's underlying file handling mechanisms.