CVE-2026-16993 in DHL Shipping Germany for WooCommerce Plugin
Summary
by MITRE • 08/05/2026
The DHL Shipping Germany for WooCommerce WordPress plugin before 4.0.1 does not protect its shipping-label storage directory with server-independent access control, relying only on an Apache .htaccess file, so on a web server that does not honor .htaccess (such as nginx) an unauthenticated visitor can download stored shipping labels (each containing a customer's name and postal address) by requesting predictable filenames.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/05/2026
This vulnerability affects the DHL Shipping Germany for WooCommerce WordPress plugin version 4.0.1 and earlier, presenting a critical security flaw in access control implementation. The plugin stores shipping labels in a dedicated directory without implementing proper server-independent access controls, instead depending solely on Apache-specific .htaccess configuration files for protection. This design choice creates a fundamental security weakness because the access control mechanism fails when deployed on web servers that do not honor .htaccess directives such as nginx or other non-Apache environments. The vulnerability stems from the assumption that all hosting environments will respect Apache-specific access control configurations, which is not always the case in modern web server deployments.
The technical flaw manifests through predictable filename patterns that allow unauthorized users to directly access stored shipping label files by requesting specific URLs. Since the plugin does not implement robust server-independent access controls, any visitor who can guess or enumerate the filenames can download these documents without authentication. Each shipping label contains sensitive customer information including full names and postal addresses, making this vulnerability particularly dangerous from a privacy and data protection perspective. The lack of proper access control enforcement means that even if the plugin is installed correctly, the security posture remains compromised on non-Apache hosting environments.
The operational impact of this vulnerability extends beyond simple unauthorized file access, as it exposes personally identifiable information to potential attackers who may exploit this weakness for identity theft, social engineering attacks, or other malicious activities. The exposure of customer postal addresses and names creates a significant privacy risk that violates data protection regulations such as GDPR, which mandates appropriate technical and organizational measures to protect personal data. Attackers could potentially harvest multiple shipping labels to build comprehensive profiles of customers, enabling targeted phishing campaigns or physical security threats. This vulnerability also represents a failure in the principle of least privilege, where sensitive data is accessible without proper authentication mechanisms.
The security implications align with CWE-284, which addresses improper access control, and reflects weaknesses in implementing server-independent access control measures. From an ATT&CK framework perspective, this vulnerability maps to T1071.004 for Application Layer Protocol and T1566 for Phishing, as it enables the extraction of sensitive data that could be used for further attacks. Organizations using this plugin on nginx or other non-Apache servers face immediate risk of data exposure, while those who rely on .htaccess files for access control may experience false security assumptions. The recommended mitigation involves implementing proper server-independent access controls such as database-backed authentication, IP-based restrictions, or custom access control mechanisms that function regardless of the web server configuration.
The vulnerability highlights the importance of considering multi-server deployment scenarios during plugin development and underscores the need for robust access control implementations that do not depend on server-specific configurations. Security best practices dictate that sensitive data storage directories should always implement proper access controls regardless of the underlying hosting environment, ensuring that authentication mechanisms work consistently across different web server platforms. Organizations should immediately update to version 4.0.1 or later and review their current deployments for potential exposure. Additionally, implementing monitoring for unauthorized file access attempts can help detect exploitation attempts and provide early warning of potential security incidents. The incident serves as a reminder of the critical importance of proper access control implementation in web applications, particularly when dealing with personal data that requires protection under various privacy regulations.