CVE-2025-66053 is a stored cross-site scripting (XSS) vulnerability identified in the Kriesi Enfold WordPress theme, affecting versions up to and including 7.1.2. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is stored persistently on the affected website. When other users or administrators visit the compromised pages, the malicious script executes in their browsers, potentially leading to session hijacking, theft of cookies, defacement, or redirection to phishing or malware sites. Stored XSS is particularly dangerous because the payload remains on the server and affects all visitors to the infected page. The vulnerability does not require authentication, increasing the risk of exploitation by unauthenticated attackers. Although no known exploits have been reported in the wild as of now, the widespread use of the Enfold theme in WordPress sites makes this a significant concern. The lack of a CVSS score indicates that the vulnerability is newly published and may not yet have an official severity rating, but the technical characteristics suggest a high risk. The vulnerability affects the confidentiality and integrity of user data and the availability of the website could be indirectly impacted through defacement or malicious redirects. The vulnerability was published on November 21, 2025, by Patchstack, and no official patch links are currently available, emphasizing the need for vigilance and interim mitigations.

For European organizations, this vulnerability could lead to unauthorized access to user sessions, theft of sensitive information, and damage to organizational reputation through website defacement or distribution of malware. Organizations relying on the Enfold theme for their corporate or e-commerce websites face risks of customer data compromise and loss of trust. The impact extends to potential regulatory consequences under GDPR if personal data is exposed due to the vulnerability. Additionally, attackers could leverage the vulnerability to pivot into more extensive network attacks if administrative credentials are compromised. The persistent nature of stored XSS means that even casual visitors to the site could be affected, increasing the scope of impact. Given the high adoption of WordPress and popular themes like Enfold in Europe, the threat is significant, especially for sectors such as finance, healthcare, and government that rely heavily on web presence and data protection.

European organizations should monitor for official patches from Kriesi and apply updates to the Enfold theme immediately upon release. Until patches are available, deploying a robust Web Application Firewall (WAF) with rules to detect and block XSS payloads can reduce risk. Regularly audit and sanitize all user inputs and comments on websites using Enfold to prevent malicious script injection. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts. Conduct security awareness training for site administrators to recognize signs of compromise. Employ security plugins that scan for malicious code and unusual behavior on WordPress sites. Maintain regular backups of website data to enable quick restoration if defacement occurs. Finally, restrict administrative access to trusted IPs and enforce multi-factor authentication to limit attacker movement if exploitation occurs.