CVE-2025-64200 is a stored Cross-site Scripting (XSS) vulnerability identified in the VillaTheme Email Template Customizer for WooCommerce plugin, affecting all versions up to and including 1.2.17. 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 an attacker with high privileges (such as an authenticated administrator or shop manager) to inject malicious JavaScript code that is stored persistently and executed in the context of other users who view the affected email templates or related administrative pages. The CVSS v3.1 base score is 5.9, reflecting a medium severity level, with attack vector being network-based, low attack complexity, but requiring privileges and user interaction. The vulnerability impacts confidentiality, integrity, and availability to a limited extent, as the malicious script could steal session tokens, manipulate email content, or perform actions on behalf of legitimate users. No public exploits have been reported yet, but the presence of stored XSS in an e-commerce plugin is concerning due to the sensitive nature of customer data and transactional workflows. The vulnerability affects WooCommerce installations using this plugin, which is popular for customizing email templates sent to customers and administrators. The flaw highlights the importance of proper input validation and output encoding in web applications, especially those handling dynamic content generation.

For European organizations operating WooCommerce-based e-commerce platforms, this vulnerability poses a risk of unauthorized script execution within the administrative or customer-facing email template interfaces. Potential impacts include theft of authentication cookies or tokens, unauthorized actions performed by attackers impersonating legitimate users, and manipulation of email content that could lead to phishing or fraud. This can damage customer trust, lead to data breaches involving personal and payment information, and disrupt business operations. Given the stored nature of the XSS, the malicious payload can persist and affect multiple users over time. Organizations with large customer bases or those handling sensitive transactions are particularly vulnerable. The medium severity score reflects that while exploitation requires authenticated access and user interaction, the scope of impact can be significant in terms of data confidentiality and integrity. Additionally, compromised administrative accounts could lead to broader system compromise. The threat is more acute in environments where plugin updates are delayed or where administrative access controls are weak.

1. Monitor VillaTheme and WooCommerce official channels for a security patch addressing CVE-2025-64200 and apply updates immediately upon release. 2. Until a patch is available, restrict administrative access to trusted personnel only and enforce strong authentication mechanisms such as multi-factor authentication (MFA). 3. Review and sanitize all inputs related to email template customization manually if possible, avoiding the use of untrusted data in templates. 4. Deploy a Web Application Firewall (WAF) with rules specifically designed to detect and block XSS payloads targeting WooCommerce plugins. 5. Conduct regular security audits and penetration testing focusing on plugin interfaces and input handling. 6. Educate administrators about the risks of stored XSS and the importance of cautious input handling and template editing. 7. Implement Content Security Policy (CSP) headers to reduce the impact of potential XSS exploitation by restricting script execution contexts. 8. Maintain comprehensive logging and monitoring to detect suspicious activities related to email template modifications or unusual administrative actions.