The vulnerability identified as CVE-2025-66528 affects the VillaTheme Thank You Page Customizer plugin for WooCommerce, specifically versions up to and including 1.1.8. It is classified as a missing authorization issue, meaning that the plugin fails to properly enforce access control checks on certain functionalities. This allows an attacker with low-level privileges (PR:L) to bypass authorization mechanisms and perform actions that should be restricted. The vulnerability does not require user interaction (UI:N) and can be exploited remotely over the network (AV:N). The CVSS v3.1 base score of 8.1 reflects a high severity, with a significant impact on confidentiality and integrity (C:H/I:H) but no impact on availability (A:N). The flaw likely stems from incorrectly configured access control security levels within the plugin’s code, potentially exposing sensitive customer data or allowing unauthorized modification of order-related information on the WooCommerce thank you page. Although no public exploits have been reported yet, the ease of exploitation combined with the critical nature of e-commerce data makes this a serious threat. The plugin is widely used in WooCommerce-based online stores, which are prevalent in Europe, increasing the risk to European organizations. The vulnerability was published on December 9, 2025, and assigned by Patchstack. No patch links are currently provided, indicating that organizations should monitor vendor communications closely for updates.

For European organizations, especially e-commerce businesses using WooCommerce with the VillaTheme Thank You Page Customizer plugin, this vulnerability poses a significant risk. Attackers exploiting this flaw can gain unauthorized access to sensitive customer information such as order details, personal data, and potentially payment information, severely compromising confidentiality. Integrity of order data can also be affected, allowing attackers to manipulate transaction records or customer communications, which can lead to fraud or reputational damage. Although availability is not directly impacted, the breach of trust and potential regulatory penalties under GDPR for data exposure can have substantial financial and legal consequences. The threat is particularly acute for mid to large-sized online retailers in Europe where WooCommerce market penetration is high. The lack of required user interaction and the ability to exploit remotely increase the attack surface. This vulnerability could also be leveraged as a foothold for further attacks within the network, escalating the impact beyond the initial compromise.

Organizations should immediately audit their WooCommerce installations to identify if the VillaTheme Thank You Page Customizer plugin version 1.1.8 or earlier is in use. Until an official patch is released, restrict access to the plugin’s administrative and customization interfaces to trusted users only, employing strict role-based access controls. Implement network-level protections such as web application firewalls (WAFs) to detect and block suspicious requests targeting the plugin endpoints. Monitor logs for unusual access patterns or privilege escalations related to the plugin. Educate administrators about the risk and ensure that all user accounts with plugin access use strong, unique credentials and multi-factor authentication where possible. Once the vendor releases a patch, apply it promptly and verify the fix through testing. Additionally, conduct a thorough review of all WooCommerce plugins for similar authorization issues and maintain an updated inventory of third-party components to reduce exposure to such vulnerabilities.