CVE-2026-114462 in vServer
Summary
by MITRE • 10/22/2026
Improper link resolution before file access ('link following') vulnerability in Velneo vServer. This issue affects vServer: from 32.3 before 36.6 and from 37.1 before 37.2.
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Analysis
by VulDB Data Team • 10/22/2026
The identified vulnerability represents a critical flaw in the path resolution logic of Velneo vServer, specifically categorized under CWE-59 Improper Link Resolution Before File Access. This class of vulnerabilities occurs when an application resolves symbolic links or relative paths prior to performing security checks on the final target file. In the context of Velneo vServer versions ranging from 32.3 up to but not including 36.6, and from 37.1 up to but not including 37.2, this architectural weakness allows an attacker to manipulate file system references during the request processing phase. The core technical failure lies in the sequence of operations where the server follows symbolic links or resolves directory traversals before validating whether the resulting path is within an allowed scope or possesses appropriate access permissions. This temporal gap between link resolution and permission verification creates a window for exploitation, enabling unauthorized entities to bypass intended access controls by pointing legitimate-looking paths toward sensitive system files or configuration data outside of their designated directories.
From an operational perspective, this vulnerability facilitates directory traversal attacks that can lead to severe information disclosure or potentially remote code execution depending on the server's configuration and available file write capabilities. An attacker could craft a malicious request containing carefully constructed path parameters that exploit the improper link resolution mechanism. By leveraging symbolic links created in accessible directories that point to restricted areas of the file system, such as /etc/passwd on Unix-like systems or critical Windows registry files and application binaries, an adversary can read sensitive data that should remain confidential. This capability undermines the fundamental principle of least privilege within the server environment, allowing low-privileged users or external attackers to escalate their access level by extracting credentials, database connection strings, or internal network topology information embedded in configuration files. The impact extends beyond mere data leakage; if the application allows file creation or modification through similar mechanisms, it could lead to arbitrary code execution, compromising the integrity and availability of the entire server infrastructure.
This vulnerability aligns with MITRE ATT&CK technique T1083 File and Directory Discovery, where adversaries search for sensitive information within a compromised system. Furthermore, it relates to CWE-22 Improper Limitation of a Pathname to a Restricted Directory when considering the broader context of path validation failures that allow access outside restricted boundaries. The exploitation vector typically involves HTTP requests or API calls directed at the vServer interface, where input parameters controlling file paths are not sufficiently sanitized against symbolic link injection or relative path manipulation. Because Velneo is often deployed in enterprise environments handling sensitive business data, the exposure of such vulnerabilities poses a significant risk to organizational security posture and regulatory compliance regarding data protection standards like GDPR or HIPAA if personal health information or personally identifiable information resides on the affected server.
Mitigation strategies must prioritize immediate patching as the primary defense mechanism. Organizations running Velneo vServer versions 32.3 through 36.5, or 37.1 through 37.1.x (before 37.2), should upgrade to version 36.6 and later, or 37.2 and later, respectively, where the vendor has addressed this path resolution logic error. In scenarios where immediate patching is not feasible due to operational constraints, administrators should implement strict input validation on all file path parameters passed to the application server. This includes rejecting any paths containing symbolic link indicators such as double slashes followed by dot-dot-slash sequences or explicit symlink references if they are not part of a whitisted directory structure. Additionally, deploying Web Application Firewalls with rulesets capable of detecting and blocking directory traversal patterns can provide an additional layer of defense against exploitation attempts while the underlying software is being updated. Regular security audits focusing on file system access controls and continuous monitoring for anomalous file read operations in restricted directories are also recommended to detect potential exploitation activities early.