CVE-2025-3813 is a stored Cross-Site Scripting (XSS) vulnerability identified in the Royal Elementor Addons and Templates plugin for WordPress, affecting all versions up to and including 1.7.1020. The vulnerability arises due to improper neutralization of input during web page generation, specifically through insufficient sanitization and escaping of the '_elementor_data' parameter. This flaw allows authenticated users with Contributor-level privileges or higher to inject arbitrary malicious scripts into pages. These scripts are stored persistently and executed whenever any user accesses the compromised page, potentially leading to session hijacking, defacement, or redirection to malicious sites. The vulnerability is classified under CWE-79, indicating improper input validation leading to XSS. The CVSS v3.1 base score is 6.4 (medium severity), reflecting a network attack vector with low attack complexity, requiring privileges but no user interaction, and impacting confidentiality and integrity with a scope change. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability's exploitation scope is significant because WordPress powers a large portion of websites globally, and Elementor is a widely used page builder plugin, making this a critical concern for sites using the affected plugin versions.

For European organizations, this vulnerability poses a moderate risk primarily to websites using WordPress with the Royal Elementor Addons and Templates plugin. Successful exploitation can lead to unauthorized script execution, enabling attackers to steal user credentials, perform actions on behalf of users, or deliver malware. This can damage organizational reputation, lead to data breaches involving personal or sensitive data protected under GDPR, and cause service disruptions. Given the stored nature of the XSS, all visitors to the compromised pages are at risk, increasing the potential impact. Organizations relying on Contributor-level user roles for content management are particularly vulnerable, as these roles can be leveraged to inject malicious payloads. The confidentiality and integrity of website content and user data are at risk, though availability is not directly impacted. This vulnerability could also be used as a foothold for further attacks within the organization's network or to target visitors, including customers or partners.

Organizations should immediately audit their WordPress installations to identify the presence of the Royal Elementor Addons and Templates plugin and verify the version in use. Until an official patch is released, it is advisable to restrict Contributor-level and higher access to trusted users only and implement strict content moderation policies. Employ Web Application Firewalls (WAFs) with custom rules to detect and block malicious payloads targeting the '_elementor_data' parameter. Utilize security plugins that sanitize inputs and outputs or implement manual input validation and output encoding for any custom code interacting with this plugin. Monitor website pages for unexpected script injections and conduct regular security scans. Additionally, consider isolating or disabling the vulnerable plugin if feasible until a patch is available. Educate content contributors about the risks of injecting untrusted content and enforce multi-factor authentication to reduce the risk of compromised accounts being used to exploit this vulnerability.