CVE-2025-15440 is a stored Cross-Site Scripting (XSS) vulnerability identified in the iONE360 configurator plugin for WordPress, affecting all versions up to and including 2.0.57. The vulnerability arises due to improper neutralization of input during web page generation, specifically insufficient sanitization and output escaping of contact form parameters. This flaw allows unauthenticated attackers to inject arbitrary JavaScript code into pages generated by the plugin. When a user visits a page containing the injected script, the malicious code executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed with the victim’s privileges. The vulnerability has a CVSS 3.1 base score of 7.2, indicating high severity, with an attack vector of network (remote), low attack complexity, no privileges required, and no user interaction needed. The scope is changed, meaning the vulnerability affects resources beyond the vulnerable component itself. Although no exploits are currently known in the wild, the nature of stored XSS makes it a significant risk for websites relying on this plugin. The vulnerability impacts confidentiality and integrity but does not directly affect availability. The plugin is used in WordPress environments, which are widely deployed globally, including Europe. The lack of a patch at the time of reporting necessitates interim mitigations such as input validation, output encoding, and limiting exposure of the vulnerable plugin’s features until an official fix is released.

For European organizations, this vulnerability poses a significant risk especially for those operating WordPress websites that utilize the iONE360 configurator plugin. Exploitation can lead to theft of sensitive user information such as login credentials and personal data, undermining user trust and potentially violating GDPR requirements related to data protection. Attackers can hijack user sessions to perform unauthorized actions, which may result in data manipulation or unauthorized transactions. This is particularly critical for e-commerce, financial services, and public sector websites where user data integrity and confidentiality are paramount. The vulnerability’s ability to be exploited without authentication or user interaction increases the attack surface and potential for automated exploitation campaigns. Organizations may face reputational damage, regulatory fines, and operational disruptions if the vulnerability is exploited. The absence of known exploits currently provides a window for proactive mitigation, but the risk remains high due to the widespread use of WordPress and the plugin’s presence in various industries across Europe.

1. Monitor the vendor’s announcements closely and apply official patches immediately once released. 2. Until a patch is available, implement strict input validation on all contact form parameters to reject or sanitize potentially malicious input. 3. Apply output encoding/escaping on all user-supplied data rendered on web pages to prevent script execution. 4. Restrict access to the vulnerable plugin’s contact form features to trusted users or IP ranges where feasible. 5. Employ Web Application Firewalls (WAFs) with rules designed to detect and block typical XSS payloads targeting this plugin. 6. Conduct regular security audits and penetration testing focusing on plugin inputs and outputs. 7. Educate site administrators and developers about secure coding practices and the risks of stored XSS. 8. Consider disabling or removing the iONE360 configurator plugin if it is not essential to reduce attack surface. 9. Implement Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. 10. Monitor logs for unusual activity or injection attempts related to contact form parameters.