CVE-2025-66071 identifies a missing authorization vulnerability in the Custom Order Numbers for WooCommerce plugin developed by tychesoftwares, affecting all versions up to and including 1.11.0. The vulnerability arises from incorrectly configured access control security levels within the plugin, which manages custom order numbering for WooCommerce-based e-commerce websites. This misconfiguration allows unauthorized users to perform actions that should be restricted, such as viewing or modifying order numbers or related order metadata, potentially leading to data integrity issues or business logic manipulation. The vulnerability does not require prior authentication or user interaction, increasing its risk profile. Although no public exploits have been reported yet, the flaw's presence in a widely used e-commerce plugin makes it a significant concern. The lack of a CVSS score indicates that the vulnerability is newly disclosed, and detailed impact metrics are pending. The plugin’s role in order management means exploitation could disrupt order processing, cause confusion in order tracking, or facilitate fraudulent activities. The vulnerability was published on November 21, 2025, by Patchstack, with no current patches linked, emphasizing the need for vendor action and user vigilance.

For European organizations operating WooCommerce stores with the affected Custom Order Numbers plugin, this vulnerability poses a substantial risk to the confidentiality, integrity, and availability of order data. Unauthorized manipulation of order numbers can lead to order processing errors, financial discrepancies, and loss of customer trust. Attackers could potentially alter order sequences, hide fraudulent transactions, or disrupt backend operations, impacting revenue and operational continuity. Given the widespread adoption of WooCommerce in Europe’s e-commerce sector, especially among small to medium enterprises, the threat could affect a broad range of businesses. Additionally, regulatory compliance risks arise if order data integrity is compromised, potentially violating GDPR requirements around data accuracy and security. The absence of authentication requirements for exploitation increases the threat's severity, making it easier for remote attackers to target vulnerable installations. The overall impact includes operational disruption, reputational damage, and potential legal consequences for affected organizations.

Organizations should immediately inventory their WooCommerce installations to identify the use of the Custom Order Numbers plugin and verify the version in use. Until an official patch is released by tychesoftwares, administrators should restrict access to WooCommerce backend interfaces to trusted personnel only, employing strong authentication and role-based access controls. Implementing Web Application Firewalls (WAFs) with custom rules to detect and block suspicious requests targeting order number management endpoints can provide interim protection. Monitoring logs for unusual activities related to order number changes or unauthorized access attempts is critical. Organizations should subscribe to vendor and security mailing lists to receive timely updates on patch releases. Once a patch is available, prioritize its deployment in all affected environments. Additionally, consider isolating the plugin’s functionality or disabling it temporarily if business operations allow, to mitigate risk. Conduct regular security audits and penetration tests focusing on e-commerce plugins to identify similar misconfigurations proactively.