CVE-2026-2753: Navtor NavBox Path Traversal Vulnerability

CVE-2026-2753 Overview

An Absolute Path Traversal vulnerability exists in Navtor NavBox that allows unauthenticated remote attackers to retrieve arbitrary files from the underlying filesystem. The application exposes an HTTP service that fails to properly sanitize user-supplied path input. By submitting requests containing absolute filesystem paths, attackers can bypass intended directory restrictions and access sensitive files. Successful exploitation is limited only by the privileges of the service process, potentially exposing sensitive configuration files and system information.

Critical Impact

Unauthenticated attackers can remotely access arbitrary files on affected Navtor NavBox systems, potentially exposing sensitive configuration data, credentials, and system information without requiring any user interaction.

Affected Products

• Navtor NavBox (version 4.12.0.3 referenced in advisory)

Discovery Timeline

• 2026-03-06 - CVE CVE-2026-2753 published to NVD
• 2026-03-10 - Last updated in NVD database

Technical Details for CVE-2026-2753

Vulnerability Analysis

This vulnerability is classified as CWE-36 (Absolute Path Traversal), which occurs when an application uses external input to construct a pathname that should be restricted to a specific directory, but fails to properly neutralize absolute path sequences. In the case of Navtor NavBox, the HTTP service accepts user-supplied path parameters without adequate validation, allowing attackers to specify absolute filesystem paths that escape the intended directory structure.

The attack can be executed remotely over the network without authentication and requires no user interaction, making it highly accessible to potential threat actors. The vulnerability specifically impacts confidentiality, allowing attackers to read arbitrary files from the system without the ability to modify or delete them.

Root Cause

The root cause of this vulnerability lies in insufficient input sanitization within the Navtor NavBox HTTP service. The application fails to validate and neutralize absolute path sequences (such as paths beginning with / on Unix systems or drive letters like C:\ on Windows) before using them to construct file paths. This allows attackers to bypass directory restrictions and access files outside the intended web root or application directory.

Attack Vector

The vulnerability is exploited through network-accessible HTTP requests to the Navtor NavBox service. Attackers craft malicious requests containing absolute filesystem paths instead of relative paths within the application's expected directory structure. When the vulnerable service processes these requests, it follows the absolute path directly, returning the contents of arbitrary files accessible by the service process.

For example, an attacker could request system configuration files, application credentials, or other sensitive data by specifying their absolute paths in HTTP requests. The attack requires no authentication, making it accessible to any network-connected attacker who can reach the vulnerable service.

Detection Methods for CVE-2026-2753

Indicators of Compromise

• HTTP access logs containing requests with absolute file paths (e.g., paths starting with /etc/, /var/, or Windows drive letters)
• Unusual file access patterns from the NavBox service process accessing system directories outside the application root
• Network traffic showing HTTP responses containing contents of system configuration files

Detection Strategies

• Configure web application firewalls (WAF) to detect and block requests containing absolute path patterns
• Implement network intrusion detection rules to identify path traversal attempts targeting the NavBox HTTP service
• Review HTTP access logs for suspicious path patterns including absolute paths and directory traversal sequences

Monitoring Recommendations

• Enable detailed logging on the Navtor NavBox HTTP service to capture all file access requests
• Monitor for abnormal outbound data transfers from NavBox systems that may indicate data exfiltration
• Set up alerts for access attempts to sensitive system files from the NavBox service context

How to Mitigate CVE-2026-2753

Immediate Actions Required

• Restrict network access to the Navtor NavBox HTTP service using firewall rules to limit exposure to trusted networks only
• Review the Navtor Vendor Statement for official guidance and available patches
• Implement network segmentation to isolate NavBox systems from critical infrastructure

Patch Information

Consult the Cydome Vulnerability Advisory and the Navtor Vendor Statement for the latest patch availability and update instructions. Organizations should prioritize applying vendor-supplied patches as soon as they become available.

Workarounds

• Deploy a reverse proxy or web application firewall in front of the NavBox service configured to reject requests containing absolute path patterns
• Restrict the NavBox service to run with minimal filesystem privileges to limit the impact of successful exploitation
• If possible, disable the vulnerable HTTP service until a patch can be applied
• Implement network access controls to limit which systems can communicate with the NavBox HTTP service