CVE-2025-13389 is a vulnerability classified under CWE-639 (Authorization Bypass Through User-Controlled Key) affecting the WordPress plugin 'Admin and Customer Messages After Order for WooCommerce: OrderConvo'. The issue stems from the absence of proper capability checks in the get_order_by_id() function, which is responsible for retrieving order details and associated customer-administrator messages. Because this function does not verify whether the requesting user has the appropriate permissions, unauthenticated attackers can supply arbitrary order IDs to access sensitive information. This includes private conversations and order details that should only be accessible to authorized users. The vulnerability affects all plugin versions up to and including version 14. The CVSS 3.1 base score is 5.3, indicating medium severity, with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and impact limited to confidentiality (C:L) without affecting integrity or availability. No patches or known exploits are currently reported, but the vulnerability poses a significant risk to the confidentiality of customer data and internal communications within WooCommerce stores using this plugin. The flaw is particularly critical in e-commerce environments where customer trust and data privacy are paramount.

For European organizations, the primary impact of this vulnerability is the unauthorized disclosure of sensitive customer order information and private messages exchanged between customers and store administrators. This breach of confidentiality can lead to loss of customer trust, reputational damage, and potential violations of data protection regulations such as the GDPR, which mandates strict controls over personal data access and processing. Although the vulnerability does not affect data integrity or system availability, the exposure of private communications and order details can facilitate further social engineering attacks or fraud. E-commerce businesses relying on WooCommerce with this plugin are particularly vulnerable, as attackers can exploit the flaw remotely without authentication or user interaction. This risk is heightened in sectors with high transaction volumes and sensitive customer data, such as retail, luxury goods, and health-related products. Additionally, the lack of known exploits in the wild suggests that proactive mitigation is critical to prevent future exploitation attempts.

1. Monitor the plugin vendor's official channels for security patches and apply updates immediately once available. 2. Until a patch is released, implement web application firewall (WAF) rules to detect and block requests containing suspicious order ID parameters targeting the get_order_by_id() function. 3. Restrict access to the WooCommerce order data endpoints by IP whitelisting or requiring authentication at the web server or application level. 4. Conduct thorough audits of user permissions and ensure that only authorized roles can access order and message data. 5. Implement logging and alerting for unusual access patterns to order details, such as repeated requests with varying order IDs from the same IP address. 6. Educate development and security teams about the risks of missing authorization checks in custom or third-party plugins. 7. Consider isolating or disabling the vulnerable plugin if it is not essential to business operations until a secure version is available. 8. Review and enhance overall WordPress and WooCommerce security posture, including regular updates, strong authentication, and least privilege principles.