CVE-2025-46254 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the Visual Composer Website Builder product up to version 45.10.0. The vulnerability arises due to 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 a victim visits a compromised page, the malicious script executes in their browser context, potentially leading to session hijacking, credential theft, unauthorized actions on behalf of the user, or distribution of malware. Stored XSS is particularly dangerous because the malicious payload persists on the server and is served to multiple users, increasing the attack surface. Visual Composer Website Builder is a widely used WordPress plugin for creating and managing website content, often employed by businesses, agencies, and individual site owners. The lack of an available patch at the time of this report increases the risk, as users remain exposed until a fix is released and applied. No known exploits are currently observed in the wild, but the medium severity rating indicates a moderate risk that could escalate if weaponized. The vulnerability does not require user authentication to exploit, as it targets input fields that are rendered on public-facing pages, making it accessible to unauthenticated attackers. The exploitation requires the attacker to inject malicious scripts into website content, which then execute in the browsers of visitors, potentially compromising confidentiality, integrity, and availability of user data and site functionality.

For European organizations using Visual Composer Website Builder, this vulnerability poses a significant risk to website integrity and user trust. Exploitation could lead to unauthorized access to sensitive user information, including personal data protected under GDPR, resulting in regulatory penalties and reputational damage. Attackers could leverage the vulnerability to perform phishing attacks, spread malware, or hijack user sessions, impacting both customers and employees. Organizations in sectors such as e-commerce, finance, healthcare, and public services, which rely heavily on web presence and handle sensitive data, are particularly vulnerable. Additionally, compromised websites could be used as launchpads for further attacks within corporate networks or to target other connected systems. The persistence of the malicious payload increases the likelihood of widespread impact across site visitors. The medium severity rating suggests that while the vulnerability is not immediately critical, the potential for escalation and exploitation remains, especially if no mitigations are applied promptly.

European organizations should implement the following specific measures: 1) Immediately audit all Visual Composer Website Builder instances to identify affected versions and prioritize updates once patches are released. 2) Employ Web Application Firewalls (WAFs) with custom rules to detect and block common XSS payload patterns targeting Visual Composer input fields. 3) Conduct thorough input validation and sanitization on all user-generated content before it is stored or rendered, using server-side controls where possible. 4) Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers, limiting the impact of potential XSS payloads. 5) Regularly monitor website logs and user reports for signs of suspicious activity indicative of XSS exploitation attempts. 6) Educate content editors and administrators on secure content management practices to avoid inadvertent injection of malicious code. 7) Prepare incident response plans specifically addressing web-based attacks to ensure rapid containment and remediation. 8) Consider isolating critical web components or using sandboxing techniques to minimize the scope of script execution. These steps go beyond generic advice by focusing on immediate protective controls and operational readiness tailored to the Visual Composer context.