CVE-2026-16981 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 perform any authorization check (no capability, nonce, login, or ownership check) on one of its shipping-label download endpoints, so an unauthenticated attacker can enumerate sequential ids and download every stored shipping label, each containing the customer's full name, complete postal address, and order reference.
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Analysis
by VulDB Data Team • 08/05/2026
The vulnerability exists within the DHL Shipping Germany for WooCommerce WordPress plugin version 4.0.1 and earlier, where a critical authorization flaw has been identified in one of the plugin's shipping label download endpoints. This represents a significant security weakness that directly violates fundamental web application security principles and could be classified under CWE-862 which addresses insufficient authorization checks. The vulnerability stems from the complete absence of any form of access control mechanism including capability checks, nonce validation, login verification, or ownership confirmation when processing requests to download shipping labels. This oversight creates an unauthenticated attack vector that allows malicious actors to exploit sequential identifier enumeration techniques to gain access to all stored shipping labels within the system.
The technical implementation flaw manifests as a lack of proper endpoint protection that should have been implemented according to standard WordPress plugin security practices and aligns with ATT&CK technique T1213 which covers data from information repositories. The vulnerability enables attackers to systematically enumerate sequential IDs and download every shipping label stored in the system, resulting in exposure of sensitive customer information including full names, complete postal addresses, and order references. This constitutes a serious privacy breach that violates data protection regulations such as GDPR where personal data is unnecessarily exposed without proper access controls.
The operational impact of this vulnerability is severe and multifaceted, creating both immediate and long-term security risks for businesses utilizing the plugin. Attackers can harvest large volumes of customer data through automated enumeration processes, potentially leading to identity theft, targeted phishing attacks, and other forms of fraud. The exposure of complete postal addresses creates opportunities for physical security threats including package interception or home break-ins. Additionally, order references provide attackers with insight into business operations and customer purchasing patterns, enabling more sophisticated social engineering attacks. The vulnerability affects all users of the plugin regardless of their authentication status, making it particularly dangerous as it requires no valid credentials to exploit.
Mitigation strategies should include immediate update to version 4.0.1 or later where the authorization flaw has been addressed through proper capability checks and nonce validation. Administrators should also implement additional security measures such as rate limiting on download endpoints to prevent automated enumeration attacks, consider implementing IP-based access restrictions for sensitive endpoints, and conduct comprehensive security audits of all plugin endpoints to ensure proper authorization mechanisms are in place. Organizations should review their current data handling practices and consider implementing additional monitoring for unusual download patterns that could indicate exploitation attempts. The fix should align with WordPress security coding standards and incorporate proper input validation and access control mechanisms as recommended by the OWASP Top Ten and NIST Cybersecurity Framework guidelines.