CVE-2025-48276 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the Visual Composer Website Builder product up to version 45.11.0. The vulnerability arises from improper neutralization of input during web page generation, allowing malicious actors to inject and store arbitrary scripts within the website content managed by Visual Composer. When other users or administrators access the affected pages, the malicious scripts execute in their browsers, potentially leading to session hijacking, credential theft, defacement, or further exploitation of the affected system. The CVSS 3.1 base score is 6.5, indicating a medium severity level. The vector details (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) show that the attack can be performed remotely over the network with low attack complexity, requires low privileges but does require user interaction (e.g., a user visiting a maliciously crafted page). The scope is changed, meaning the vulnerability affects components beyond the initially vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent. No known exploits are currently reported in the wild, and no official patches have been linked yet, though the vulnerability is publicly disclosed as of May 19, 2025. This vulnerability is particularly relevant for websites using Visual Composer Website Builder, a popular WordPress page builder plugin, which is widely used for creating and managing website content without coding. The stored XSS nature means injected scripts persist in the website's database and affect all users who view the compromised content.

For European organizations, the impact of CVE-2025-48276 can be significant, especially for those relying on WordPress websites built with Visual Composer Website Builder. Exploitation could lead to unauthorized access to user sessions, theft of sensitive data such as login credentials or personal information, and potential defacement or manipulation of website content. This can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR violations due to data breaches), and disrupt business operations. The medium severity score reflects that while the vulnerability requires some user interaction and low privileges, the consequences can still affect multiple security properties and potentially spread across interconnected systems due to the changed scope. Attackers could leverage this vulnerability to conduct phishing campaigns, spread malware, or pivot to internal networks if administrative users are compromised. The lack of known exploits currently provides a window for proactive mitigation, but the widespread use of Visual Composer in Europe increases the risk of targeted attacks once exploit code becomes available.

European organizations should take immediate steps to mitigate this vulnerability beyond generic advice. First, conduct an inventory to identify all WordPress sites using Visual Composer Website Builder and verify the version in use. Since no official patch links are currently available, monitor vendor communications and security advisories closely for updates or patches. In the interim, implement Web Application Firewall (WAF) rules specifically targeting common XSS payloads and patterns associated with Visual Composer vulnerabilities to block exploitation attempts. Restrict user privileges to the minimum necessary, especially limiting who can create or edit content within Visual Composer to reduce the risk of malicious input. Enable Content Security Policy (CSP) headers to restrict script execution sources, which can mitigate the impact of stored XSS. Regularly audit website content for suspicious scripts or injected code. Educate users and administrators about the risks of clicking unknown links or interacting with untrusted content on affected sites. Finally, prepare incident response plans to quickly address any exploitation attempts or breaches related to this vulnerability.