CVE-2025-67083: InvoicePlane Path Traversal Vulnerability

CVE-2025-67083 Overview

A directory traversal vulnerability exists in InvoicePlane through version 1.6.3 that allows unauthenticated attackers to read arbitrary files from the server. This flaw enables malicious actors to bypass directory restrictions and access sensitive files outside the intended web root directory. The specific files that can be accessed and the nature of the exposure depend on the web server configuration and deployment environment.

Critical Impact

Unauthenticated attackers can exploit this vulnerability to read sensitive configuration files, database credentials, and other confidential data from affected InvoicePlane installations without any authentication requirements.

Affected Products

• InvoicePlane versions through 1.6.3
• All deployments using default configurations
• Installations on various web server platforms (Apache, Nginx, etc.)

Discovery Timeline

• 2026-01-15 - CVE-2025-67083 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-67083

Vulnerability Analysis

This directory traversal vulnerability (CWE-22) in InvoicePlane allows unauthenticated remote attackers to read files from the server by manipulating file path parameters. The application fails to properly sanitize user-supplied input containing directory traversal sequences such as ../ (dot-dot-slash), enabling attackers to escape the intended directory structure and access files elsewhere on the file system.

The vulnerability is particularly concerning because it requires no authentication, meaning any remote attacker with network access to the application can potentially exploit it. The impact varies based on the web server configuration—some configurations may restrict readable file types while others may expose a broader range of sensitive data including configuration files, application source code, and potentially database credentials.

Root Cause

The root cause of this vulnerability is improper input validation and insufficient path canonicalization in InvoicePlane's file handling routines. The application does not adequately filter or neutralize special path elements (such as .. sequences) before using user-supplied input to construct file paths, allowing attackers to traverse outside the application's intended directory scope.

Attack Vector

The vulnerability is exploitable over the network without requiring any privileges or user interaction. An attacker can craft malicious HTTP requests containing directory traversal sequences to access files outside the web application's root directory. The attack complexity is low, as exploitation requires only basic knowledge of directory traversal techniques and the target's file system structure.

Attackers typically probe for common sensitive files such as /etc/passwd on Linux systems, application configuration files containing database credentials, or environment files that may contain API keys and secrets. The specific files accessible depend on the web server's configuration, file permissions, and the user context under which the web server process runs.

For detailed technical information about this vulnerability, refer to the Helx Blog Advisory and the GitHub InvoicePlane Repository.

Detection Methods for CVE-2025-67083

Indicators of Compromise

• HTTP request logs containing directory traversal sequences such as ../, ..%2f, %2e%2e/, or similar encoded variants
• Unusual access patterns to file resources outside normal application paths
• Access attempts to sensitive system files such as /etc/passwd, configuration files, or environment files
• Error logs indicating file access attempts to restricted directories

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing path traversal patterns
• Monitor HTTP access logs for suspicious URL patterns with encoded or decoded traversal sequences
• Configure intrusion detection systems (IDS) to alert on directory traversal attack signatures
• Deploy application-layer monitoring to detect anomalous file access requests

Monitoring Recommendations

• Enable verbose logging on web servers to capture full request URLs and parameters
• Set up automated alerts for requests containing .. sequences or URL-encoded equivalents
• Regularly review access logs for patterns consistent with reconnaissance or exploitation attempts
• Monitor file system access logs for unusual read operations by the web server process

How to Mitigate CVE-2025-67083

Immediate Actions Required

• Update InvoicePlane to the latest available version that addresses this vulnerability
• Review and restrict file system permissions for the web server user account
• Implement web application firewall rules to block directory traversal attempts
• Audit existing access logs for signs of prior exploitation

Patch Information

Organizations using InvoicePlane should check the GitHub InvoicePlane Repository for the latest security updates and patch releases. Review the Helx Blog Advisory for additional technical guidance and remediation steps.

Workarounds

• Configure web server rules to reject requests containing directory traversal sequences
• Restrict the web server process to run with minimal file system privileges
• Use a chroot environment or containerization to limit file system access scope
• Implement network segmentation to limit exposure of vulnerable InvoicePlane installations

# Example Apache configuration to block directory traversal attempts
# Add to .htaccess or virtual host configuration
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./|\.\.\\) [NC]
RewriteRule .* - [F,L]