CVE-2025-5570 is a medium-severity Stored Cross-Site Scripting (XSS) vulnerability affecting the AI Engine plugin for WordPress developed by tigroumeow. The vulnerability exists in all versions up to and including 2.8.4, specifically in the mwai_chatbot shortcode's 'id' parameter. Due to insufficient input sanitization and output escaping, authenticated users with Subscriber-level access or higher can inject arbitrary malicious scripts into pages. These scripts execute 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 neutralization of input during web page generation. The CVSS 3.1 base score is 5.4 (medium), with vector AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N, meaning the attack is network exploitable with low complexity, requires low privileges (authenticated Subscriber), user interaction (visiting the page), and impacts confidentiality and integrity with a scope change but no availability impact. No known exploits are currently reported in the wild, and no patches are linked yet. This vulnerability highlights the risks of insufficient input validation in WordPress plugins, especially those handling user-generated content or shortcodes that render dynamic content on pages.

For European organizations using WordPress sites with the tigroumeow AI Engine plugin, this vulnerability poses a risk of persistent XSS attacks that can compromise user sessions, steal sensitive information, or manipulate site content. Given WordPress's widespread use in Europe for corporate, governmental, and small business websites, exploitation could lead to reputational damage, data breaches, and loss of user trust. The requirement for authenticated Subscriber-level access reduces the attack surface but does not eliminate risk, as many sites allow user registrations or have multiple users with such privileges. The scope change in the CVSS vector indicates that the vulnerability can affect resources beyond the vulnerable component, potentially impacting other parts of the web application or user data. European organizations in sectors with strict data protection regulations (e.g., GDPR) must be particularly cautious, as exploitation could lead to regulatory penalties if personal data is compromised. Additionally, the vulnerability could be leveraged in targeted attacks against high-value European targets using WordPress, including government portals, educational institutions, and e-commerce platforms.

European organizations should immediately audit their WordPress installations to identify the presence of the tigroumeow AI Engine plugin and verify the version in use. Until an official patch is released, administrators should consider disabling the mwai_chatbot shortcode or restricting its usage to trusted users only. Implementing Web Application Firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the 'id' parameter can provide interim protection. Organizations should enforce strict user role management to limit Subscriber-level access and monitor user activities for anomalous behavior. Regular security scanning and penetration testing focusing on XSS vectors in plugins are recommended. Once a patch becomes available, prompt application of updates is critical. Additionally, applying Content Security Policy (CSP) headers can help mitigate the impact of XSS by restricting script execution sources. Educating users to avoid clicking on suspicious links and reporting unusual site behavior can also reduce exploitation risks.