CVE-2025-66528 identifies a missing authorization vulnerability in the VillaTheme Thank You Page Customizer plugin for WooCommerce, specifically affecting versions up to and including 1.1.8. The vulnerability arises from incorrectly configured access control security levels, which means that certain actions or resources intended to be restricted can be accessed without proper authorization. This flaw could allow an attacker, potentially without authentication or with limited privileges, to perform unauthorized operations related to the thank you page customization feature in WooCommerce. Such unauthorized access could lead to manipulation of order confirmation pages, exposure of sensitive customer data, or insertion of malicious content, undermining the integrity and confidentiality of the e-commerce platform. Although no exploits have been reported in the wild, the vulnerability's presence in a widely used e-commerce plugin makes it a significant risk. The lack of a CVSS score necessitates an assessment based on the potential impact on confidentiality, integrity, and availability, the ease of exploitation, and the scope of affected systems. Given that WooCommerce is a popular e-commerce solution in Europe and the plugin is used to customize critical customer-facing pages, the vulnerability could have widespread implications if exploited. The vulnerability was published on December 9, 2025, and no patch links are currently available, indicating that users should be vigilant and consider interim protective measures.

For European organizations, especially those operating e-commerce platforms using WooCommerce with the VillaTheme Thank You Page Customizer plugin, this vulnerability could lead to unauthorized modifications of the thank you page, potentially misleading customers or exposing sensitive order information. This could damage customer trust, lead to data breaches involving personal or payment information, and result in financial losses or regulatory penalties under GDPR. The integrity of order confirmation processes could be compromised, affecting business operations and customer experience. Since the vulnerability involves missing authorization, attackers might exploit it without needing to authenticate, increasing the risk of widespread abuse. The impact is particularly critical for mid to large-sized online retailers in Europe, where WooCommerce has significant market penetration. Additionally, the absence of a patch increases the window of exposure, necessitating immediate risk management actions.

European organizations should immediately inventory their WooCommerce installations to identify if the VillaTheme Thank You Page Customizer plugin is in use and verify the version. Until a patch is released, restrict access to the plugin’s administrative and customization interfaces using web application firewalls (WAFs), IP whitelisting, or network segmentation to limit exposure. Implement strict role-based access controls within WordPress to ensure only trusted administrators can modify thank you page settings. Monitor logs for unusual access patterns or unauthorized changes to thank you pages. Consider disabling the plugin temporarily if the risk outweighs the business need. Stay informed through vendor communications and security advisories for the release of official patches. Additionally, conduct regular security audits and penetration tests focusing on WooCommerce plugins to detect similar misconfigurations. Employ Content Security Policy (CSP) headers to mitigate potential injection of malicious content via compromised thank you pages.