CVE-2025-11841 is a stored Cross-Site Scripting vulnerability identified in the Greenshift – animation and page builder blocks plugin for WordPress, developed by wpsoul. This vulnerability arises from improper neutralization of input during web page generation (CWE-79), specifically through the Chart Data attributes used in the plugin. All versions up to and including 12.2.7 are affected. The root cause is insufficient input sanitization and output escaping, which allows authenticated users with Contributor-level access or higher to inject arbitrary JavaScript code into pages. Because the malicious script is stored persistently in the page content, it executes whenever any user accesses the infected page, potentially compromising user sessions, stealing cookies, or performing unauthorized actions on behalf of users. The vulnerability has a CVSS 3.1 score of 6.4, indicating medium severity, with an attack vector over the network, low attack complexity, requiring privileges but no user interaction, and impacting confidentiality and integrity with a scope change. No public exploits have been reported yet, but the risk remains significant due to the ease of exploitation by authenticated contributors. The vulnerability affects a widely used WordPress plugin, which is popular among website administrators for creating animated and interactive page content. The persistent nature of the XSS increases the risk of widespread impact if exploited. The vulnerability was published on November 4, 2025, with no patch links currently available, emphasizing the need for immediate mitigation steps by affected users.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of their web platforms. Since WordPress powers a large portion of websites across Europe, and Greenshift is a popular plugin for animation and page building, many organizations could be exposed. Exploitation could lead to session hijacking, unauthorized actions performed in the context of legitimate users, defacement, or distribution of malware through compromised websites. This can damage organizational reputation, lead to data breaches involving personal data protected under GDPR, and cause service disruptions. The requirement for Contributor-level access means insider threats or compromised contributor accounts could be leveraged to exploit this vulnerability. The scope change in the CVSS vector indicates that the attack can affect components beyond the initially compromised plugin, potentially impacting other parts of the website or integrated systems. Given the interconnected nature of European digital infrastructure, exploitation could also facilitate lateral movement or further attacks within organizational networks.

1. Immediately audit user roles and restrict Contributor-level access to trusted personnel only, minimizing the risk of malicious input injection. 2. Implement strict input validation and output encoding on all Chart Data attributes within the Greenshift plugin, either by applying vendor patches when available or by custom hardening if patches are delayed. 3. Monitor website content for suspicious or unexpected script injections, using web application firewalls (WAFs) with rules targeting stored XSS patterns specific to this plugin. 4. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on affected web pages. 5. Regularly update WordPress core and all plugins, including Greenshift, to the latest versions once patches are released. 6. Conduct security awareness training for contributors to recognize phishing or social engineering attempts that could lead to account compromise. 7. Consider implementing multi-factor authentication (MFA) for all accounts with elevated privileges to reduce the risk of unauthorized access. 8. Backup website data regularly to enable quick restoration in case of compromise. 9. Engage in proactive vulnerability scanning and penetration testing focused on XSS vulnerabilities in WordPress environments.