The vulnerability identified as CVE-2025-13930 affects the Checkout Field Manager (Checkout Manager) plugin for WooCommerce, a popular WordPress plugin used to customize checkout fields and manage attachments related to orders. The core issue is a missing authorization check (CWE-862) that allows unauthenticated attackers to delete attachments associated with guest orders. This occurs because the plugin fails to properly verify whether a user is authorized to perform deletion operations. Additionally, the guest order ownership validation is flawed, enabling attackers to exploit the publicly available 'wooccm_upload' nonce and attachment ID to delete attachments without authentication or user interaction. The CVSS 3.1 base score is 5.3 (medium severity), reflecting that the attack vector is network-based, requires no privileges or user interaction, and impacts integrity but not confidentiality or availability. The vulnerability affects all versions up to and including 7.8.5 of the plugin. Although no patches or exploits are currently reported, the risk lies in unauthorized deletion of order-related attachments, which could disrupt order processing or cause data loss. The vulnerability is particularly concerning for e-commerce sites handling guest checkouts where attachments might include important customer or order information.

For European organizations, especially those operating e-commerce platforms using WooCommerce with the Checkout Field Manager plugin, this vulnerability poses a risk to the integrity of order data. Unauthorized deletion of attachments could lead to loss of critical order-related documents such as invoices, receipts, or customer-uploaded files, potentially disrupting order fulfillment and customer service. While the vulnerability does not expose sensitive data directly or cause service outages, the integrity compromise could degrade trust and operational efficiency. Attackers could exploit this flaw to cause confusion, manipulate order records, or interfere with dispute resolution processes. Given the widespread use of WooCommerce in Europe, particularly in countries with mature e-commerce markets, the impact could be significant if exploited at scale. The lack of authentication and user interaction requirements lowers the barrier for exploitation, increasing the threat surface for European online retailers.

To mitigate this vulnerability, organizations should immediately verify if they use the Checkout Field Manager plugin version 7.8.5 or earlier and plan to upgrade to a patched version once available. In the absence of an official patch, administrators should implement strict access controls on endpoints handling attachment deletion, ensuring only authorized users can perform such actions. Reviewing and hardening nonce validation mechanisms to prevent misuse of publicly available nonces is critical. Web application firewalls (WAFs) can be configured to detect and block suspicious requests targeting the deletion functionality. Monitoring logs for unusual deletion attempts or patterns involving the 'wooccm_upload' nonce and attachment IDs can help identify exploitation attempts early. Additionally, restricting guest checkout attachment functionality or disabling it temporarily may reduce exposure. Regular backups of order-related attachments should be maintained to recover from unauthorized deletions. Finally, educating development teams on secure authorization practices can prevent similar issues in future plugin updates.