CVE-2025-11994 is a stored cross-site scripting (XSS) vulnerability identified in the Easy Email Subscription plugin for WordPress, developed by yudiz. This vulnerability affects all versions up to and including 1.3. The root cause is insufficient sanitization and escaping of the 'name' parameter during web page generation, which allows unauthenticated attackers to inject arbitrary JavaScript code into pages rendered by the plugin. When a user accesses a page containing the injected script, the malicious code executes in the context of the victim's browser, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability is classified under CWE-79, indicating improper neutralization of input during web page generation. The CVSS v3.1 base score is 7.2, reflecting a high severity due to network attack vector, low attack complexity, no privileges required, no user interaction needed, and a scope change. Although no public exploits have been reported yet, the vulnerability's characteristics make it a prime target for attackers aiming to compromise WordPress sites using this plugin. The lack of available patches at the time of disclosure necessitates immediate mitigation efforts by administrators.

The impact of CVE-2025-11994 is significant for organizations using the Easy Email Subscription plugin on WordPress sites. Successful exploitation allows attackers to execute arbitrary scripts in the browsers of site visitors, potentially leading to theft of sensitive information such as cookies, session tokens, or personal data. This can facilitate account takeover, unauthorized actions, or phishing attacks. The vulnerability compromises confidentiality and integrity but does not directly affect availability. Because the attack requires no authentication or user interaction, it can be exploited remotely and at scale, increasing the risk of widespread compromise. Organizations with high-traffic websites or those handling sensitive user data face elevated risks, including reputational damage, regulatory penalties, and loss of customer trust. Additionally, attackers might use the vulnerability as a foothold for further attacks within the network or to distribute malware.

To mitigate CVE-2025-11994, organizations should first check for any official patches or updates from yudiz and apply them immediately once available. In the absence of patches, administrators can implement the following specific measures: 1) Disable or remove the Easy Email Subscription plugin until a secure version is released. 2) Employ a Web Application Firewall (WAF) with custom rules to detect and block suspicious input patterns targeting the 'name' parameter, especially scripts or HTML tags. 3) Implement strict Content Security Policy (CSP) headers to restrict execution of inline scripts and reduce the impact of injected scripts. 4) Sanitize and validate all user inputs at the application level, ensuring that any data rendered on pages is properly escaped. 5) Monitor web server and application logs for unusual requests or payloads indicative of exploitation attempts. 6) Educate site administrators and users about the risks of XSS and encourage regular security audits of plugins and themes. These targeted actions go beyond generic advice and address the vulnerability's specific attack vector and exploitation method.