CVE-2025-11868 is a stored cross-site scripting vulnerability identified in the everviz plugin for WordPress, which provides interactive charts, maps, and tables. The vulnerability exists because the plugin fails to properly sanitize or escape user input when processing the `everviz` shortcode attributes, specifically the `type` and `hash` parameters. These attributes are used to build a `<div id=...>` element dynamically, and improper handling allows an authenticated user with contributor-level privileges or higher to inject arbitrary JavaScript code. This malicious code is stored persistently in the WordPress database and executed in the context of any user who visits the infected page, including administrators and other privileged users. The vulnerability does not require user interaction to trigger once the page is loaded, and the attacker must have at least contributor access, which is a moderate privilege level in WordPress. The CVSS 3.1 score of 6.4 reflects a medium severity rating, with network attack vector, low attack complexity, and partial impact on confidentiality and integrity but no impact on availability. No public exploits have been reported yet, but the vulnerability poses a significant risk of session hijacking, credential theft, or unauthorized actions performed on behalf of legitimate users. The vulnerability affects all versions of the everviz plugin up to and including 1.1, and no official patch links are currently available. The issue was reserved in October 2025 and published in November 2025 by Wordfence.

For European organizations, this vulnerability can lead to unauthorized script execution on WordPress sites using the everviz plugin, potentially compromising user sessions, stealing sensitive data, or defacing websites. Organizations with multiple contributors or editors on their WordPress platforms are particularly vulnerable, as attackers require contributor-level access to exploit the flaw. The impact extends to the confidentiality and integrity of data, as malicious scripts can exfiltrate information or manipulate content. Although availability is not directly affected, the reputational damage and potential regulatory consequences under GDPR for data breaches could be significant. Attackers could leverage this vulnerability to target internal users or administrators, escalating the risk of broader compromise. Given the widespread use of WordPress across Europe, especially in small and medium enterprises and public sector websites, the threat is non-trivial. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the potential for future attacks.

European organizations should immediately audit their WordPress installations to identify the presence of the everviz plugin and verify the version in use. Until an official patch is released, restrict contributor and higher-level user permissions to trusted personnel only, minimizing the risk of malicious shortcode injection. Employ web application firewalls (WAFs) with robust XSS detection and prevention rules to block suspicious payloads targeting shortcode attributes. Implement Content Security Policy (CSP) headers to limit the execution of unauthorized scripts on affected sites. Regularly monitor logs and user activity for unusual behavior indicative of exploitation attempts. Educate content contributors about the risks of injecting untrusted code or content. Once a patch is available, prioritize updating the plugin to the fixed version. Additionally, consider disabling or removing the everviz plugin if it is not essential to reduce the attack surface. Conduct penetration testing focused on XSS vectors in WordPress environments to identify similar vulnerabilities.