CVE-2025-11994 identifies a stored Cross-Site Scripting (XSS) vulnerability in the Easy Email Subscription plugin for WordPress, affecting all versions up to and including 1.3. The vulnerability stems from improper neutralization of input during web page generation, specifically inadequate sanitization and output escaping of the 'name' parameter. This flaw allows unauthenticated attackers to inject arbitrary JavaScript code into pages generated by the plugin. When other users access these compromised pages, the injected scripts execute in their browsers, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability has a CVSS 3.1 base score of 7.2, reflecting its high impact and ease of exploitation (network vector, no privileges or user interaction required, and scope change). Although no public exploits have been reported yet, the vulnerability's nature and the widespread use of WordPress and its plugins make it a significant risk. The absence of available patches increases the urgency for mitigation. The vulnerability is classified under CWE-79, a common and dangerous web application security weakness. The plugin's popularity among small to medium-sized businesses and content creators increases the attack surface. Attackers could leverage this vulnerability to compromise user trust, steal sensitive information, or pivot to further attacks within compromised environments.

For European organizations, the impact of CVE-2025-11994 can be substantial. Organizations relying on the Easy Email Subscription plugin for customer engagement or newsletter sign-ups risk exposure of their users to malicious scripts. This can lead to data breaches involving personally identifiable information (PII), session hijacking, and unauthorized actions performed on behalf of users. Such incidents can damage brand reputation, result in regulatory penalties under GDPR for insufficient data protection, and disrupt business operations. The vulnerability's ability to be exploited without authentication and user interaction increases the likelihood of automated attacks and widespread exploitation. E-commerce platforms, financial services, and public sector websites using this plugin are particularly vulnerable due to the sensitivity of their data and the criticality of their services. Additionally, the scope change in the CVSS vector indicates that exploitation could affect resources beyond the initially vulnerable component, potentially compromising entire websites or networks. The lack of known exploits in the wild currently provides a window for proactive defense, but the risk of rapid weaponization remains high.

1. Monitor the yudiz plugin repository and official channels for security patches addressing CVE-2025-11994 and apply updates immediately upon release. 2. Until patches are available, implement strict input validation and output encoding on all user-supplied data, particularly the 'name' parameter, to prevent script injection. 3. Deploy a Web Application Firewall (WAF) with custom rules to detect and block typical XSS payloads targeting the affected plugin. 4. Conduct thorough security audits of WordPress sites using the Easy Email Subscription plugin to identify and remove any injected malicious scripts. 5. Educate site administrators and developers on secure coding practices and the risks of stored XSS vulnerabilities. 6. Limit plugin usage to trusted environments and consider alternative subscription solutions with better security track records. 7. Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 8. Regularly back up website data and configurations to enable rapid recovery in case of compromise. 9. Monitor web server logs and user reports for signs of suspicious activity or exploitation attempts. 10. Coordinate with incident response teams to prepare for potential exploitation scenarios.