CVE-2025-64200 identifies a Stored Cross-site Scripting (XSS) vulnerability in the VillaTheme Email Template Customizer plugin for WooCommerce, a popular WordPress plugin used to customize email templates sent by WooCommerce stores. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, specifically within the email template customization functionality. This flaw allows attackers to inject malicious JavaScript code that is stored persistently within the plugin's data, such as in customized email templates. When an administrator or user views the affected email template or receives an email generated from it, the malicious script executes in their browser context. This can lead to a range of attacks including session hijacking, theft of sensitive information, or further exploitation of the affected system. The vulnerability affects all versions of the plugin up to and including 1.2.17. No CVSS score has been assigned yet, and no known exploits have been reported in the wild as of the publication date. The vulnerability was published on October 29, 2025, by Patchstack. The plugin is widely used in WooCommerce-based e-commerce sites, which are prevalent across Europe. The stored nature of the XSS increases the risk as the malicious payload persists and can affect multiple users. The lack of a patch link indicates that a fix may not yet be publicly available, emphasizing the need for proactive mitigation. Attackers do not require user interaction beyond the victim viewing the malicious email or template, increasing the attack surface. This vulnerability primarily impacts confidentiality and integrity, with potential secondary impacts on availability if leveraged for further attacks.

For European organizations, especially e-commerce businesses using WooCommerce with the VillaTheme Email Template Customizer plugin, this vulnerability poses a significant risk. Successful exploitation could lead to unauthorized access to administrative accounts or customer data through session hijacking or credential theft. This undermines customer trust and can result in regulatory penalties under GDPR due to data breaches. The persistent nature of the stored XSS means multiple users can be affected over time, amplifying the damage. Attackers could also use this vector to distribute malware or conduct phishing campaigns by injecting malicious content into legitimate emails. The impact extends beyond individual organizations to their customers and partners, potentially causing widespread reputational damage. Given the critical role of email communications in order confirmations, notifications, and customer engagement, disruption or compromise of these channels could affect business operations and revenue. European organizations with limited security monitoring or outdated plugin versions are particularly vulnerable. The absence of known exploits currently provides a window for mitigation, but the risk of future exploitation remains high.

1. Immediately audit all WooCommerce installations for the presence of the VillaTheme Email Template Customizer plugin and identify versions up to 1.2.17. 2. Monitor VillaTheme and WooCommerce official channels for the release of a security patch addressing CVE-2025-64200 and apply updates promptly once available. 3. In the interim, restrict access to the email template customization interface to trusted administrators only, minimizing exposure. 4. Implement strict input validation and sanitization on all user inputs related to email templates, either through custom code or security plugins that enforce content filtering. 5. Deploy Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in the admin dashboard and email preview interfaces. 6. Conduct regular security awareness training for administrators to recognize suspicious email content and potential XSS indicators. 7. Use web application firewalls (WAFs) with rules targeting XSS payloads to detect and block exploitation attempts. 8. Review and harden email client configurations to disable automatic script execution where possible. 9. Maintain comprehensive logging and monitoring to detect unusual activities related to email template modifications or access. 10. Consider isolating email template management to a separate environment with limited network access to reduce attack surface.