CVE-2025-64220 is a Stored Cross-site Scripting (XSS) vulnerability identified in ReyCommerce Rey Core, an e-commerce platform component, affecting versions up to and including 3.1.8. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, allowing malicious scripts to be stored on the server and later executed in the browsers of users who access the affected pages. This persistent XSS flaw can be exploited by attackers to inject arbitrary JavaScript code, which can lead to session hijacking, theft of sensitive information such as cookies or credentials, defacement of web content, or redirection to malicious sites. The vulnerability does not require authentication, meaning any unauthenticated attacker can exploit it by submitting crafted input to the vulnerable web application. No user interaction beyond visiting the compromised page is necessary for exploitation, increasing the risk. Although no public exploits have been reported yet, the nature of stored XSS vulnerabilities makes them a significant threat, especially for e-commerce platforms where user trust and data confidentiality are critical. The lack of a CVSS score indicates that the vulnerability is newly disclosed, but the technical details and typical impact of stored XSS justify a high severity rating. ReyCommerce Rey Core is used by various online retailers, and the vulnerability affects all versions up to 3.1.8, with no patch currently linked. The vulnerability was published on October 29, 2025, by Patchstack, highlighting the need for immediate attention from affected organizations.

For European organizations, the impact of CVE-2025-64220 can be substantial, particularly for those operating e-commerce websites using ReyCommerce Rey Core. Exploitation could lead to unauthorized access to user sessions, enabling attackers to impersonate legitimate users, potentially leading to fraudulent transactions, theft of personal and payment data, and damage to brand reputation. The persistent nature of the XSS means that malicious scripts can affect multiple users over time, increasing the scope of compromise. This can also facilitate further attacks such as phishing or malware distribution targeting European customers. Regulatory implications under GDPR are significant, as data breaches involving personal data could result in heavy fines and legal consequences. Additionally, the disruption of e-commerce services can lead to financial losses and erosion of customer trust. The vulnerability's ease of exploitation without authentication increases the risk profile for European businesses, especially those with high traffic volumes and sensitive customer data.

1. Monitor ReyCommerce vendor announcements closely and apply security patches promptly once they become available for versions up to 3.1.8. 2. Implement robust input validation on all user-supplied data to ensure that potentially malicious scripts are sanitized before storage or rendering. 3. Employ context-aware output encoding to neutralize any untrusted data before it is included in web pages, preventing script execution. 4. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 5. Conduct regular security audits and penetration testing focused on input handling and XSS vulnerabilities within the ReyCommerce environment. 6. Educate developers and administrators on secure coding practices related to input handling and output encoding. 7. Consider implementing Web Application Firewalls (WAFs) with rules specifically designed to detect and block XSS payloads targeting ReyCommerce applications. 8. Review and limit user privileges to minimize the potential damage from compromised accounts. 9. Maintain comprehensive logging and monitoring to detect suspicious activities indicative of exploitation attempts.