CVE-2025-39391: WooCommerce Path Traversal Vulnerability

CVE-2025-39391 Overview

CVE-2025-39391 is a Local File Inclusion (LFI) vulnerability affecting the Checkout Field Visibility for WooCommerce WordPress plugin. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server's filesystem. This type of vulnerability (CWE-98) can lead to sensitive information disclosure, configuration file exposure, and in some cases, remote code execution when combined with other attack techniques.

Critical Impact

Attackers can exploit this vulnerability to read sensitive files from the WordPress installation, potentially exposing database credentials, API keys, and other configuration secrets stored on the server.

Affected Products

• Checkout Field Visibility for WooCommerce versions up to and including 1.3.0
• WordPress installations running the vulnerable plugin
• WooCommerce-based e-commerce stores using this plugin for checkout customization

Discovery Timeline

• 2025-04-24 - CVE-2025-39391 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-39391

Vulnerability Analysis

The Checkout Field Visibility for WooCommerce plugin contains a PHP Local File Inclusion vulnerability due to improper validation of user-supplied input used in file inclusion operations. The vulnerability allows an attacker to manipulate filename parameters that are passed to PHP's include() or require() functions without adequate sanitization.

When successfully exploited, an attacker can traverse directory structures and include arbitrary files from the local filesystem. This can result in exposure of sensitive configuration files such as wp-config.php, which contains database credentials, authentication keys, and other critical WordPress settings.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and sanitization for user-controlled parameters that determine which PHP files are included. The plugin fails to implement adequate allowlist-based validation or proper canonicalization of file paths before using them in include statements. This allows attackers to use path traversal sequences (such as ../) to escape intended directories and access arbitrary files on the server.

Attack Vector

The vulnerability is exploited by submitting crafted requests containing path traversal sequences to parameters that control file inclusion. An attacker can manipulate these parameters to include local files outside the intended directory scope.

For example, an attacker might craft a request that traverses up the directory tree to access the WordPress configuration file or other sensitive system files. When combined with writable log files or uploaded content, this LFI vulnerability could potentially be escalated to achieve remote code execution through log poisoning or similar techniques.

The attack requires network access to the vulnerable WordPress installation but does not necessarily require authentication, depending on how the affected functionality is exposed. See the Patchstack security advisory for detailed technical information.

Detection Methods for CVE-2025-39391

Indicators of Compromise

• Unusual HTTP requests containing path traversal patterns such as ../ or ..%2f targeting the checkout-field-visibility-for-woocommerce plugin
• Web server access logs showing attempts to access sensitive files like wp-config.php or /etc/passwd
• Error logs indicating failed file inclusion attempts or unexpected file access patterns
• Anomalous activity from the WooCommerce checkout process or plugin-specific endpoints

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Deploy file integrity monitoring on critical WordPress configuration files to detect unauthorized access or modifications
• Enable detailed access logging and monitor for suspicious patterns targeting the vulnerable plugin directory
• Use WordPress security plugins that can detect and alert on LFI attack attempts

Monitoring Recommendations

• Review web server logs regularly for path traversal attempts targeting /wp-content/plugins/checkout-field-visibility-for-woocommerce/
• Monitor for unusual file read operations on the server, particularly targeting configuration files
• Implement alerting for failed PHP include/require operations in application logs
• Track plugin version inventory across WordPress installations to identify vulnerable deployments

How to Mitigate CVE-2025-39391

Immediate Actions Required

• Update the Checkout Field Visibility for WooCommerce plugin to a version newer than 1.3.0 if available
• If no patch is available, consider temporarily deactivating the plugin until a fix is released
• Review web server access logs for signs of exploitation attempts
• Implement WAF rules to block path traversal patterns as an additional layer of defense

Patch Information

The vulnerability affects Checkout Field Visibility for WooCommerce versions through 1.3.0. Users should check the Patchstack advisory and the WordPress plugin repository for updated versions containing the security fix. Contact the plugin developer (zamartz) for information on patched releases.

Workarounds

• Temporarily disable the Checkout Field Visibility for WooCommerce plugin if business operations permit
• Implement web application firewall rules to filter requests containing directory traversal sequences
• Restrict access to the WordPress admin area and plugin endpoints using IP allowlisting where feasible
• Apply the principle of least privilege to PHP processes, limiting file system access to only required directories

# Example .htaccess rules to block common LFI patterns
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (\.\./) [NC,OR]
    RewriteCond %{QUERY_STRING} (\.\.%2f) [NC,OR]
    RewriteCond %{QUERY_STRING} (%2e%2e/) [NC]
    RewriteRule .* - [F,L]
</IfModule>