CVE-2025-64224 is a reflected Cross-site Scripting (XSS) vulnerability found in the ThemeGoods Grand Conference Theme Custom Post Type plugin for WordPress, affecting versions prior to 2.6.4. The vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing attackers to inject malicious scripts that are reflected back to users. This flaw does not require authentication but does require user interaction, such as clicking a crafted URL or visiting a maliciously crafted page. The vulnerability impacts confidentiality by potentially exposing sensitive session data, integrity by enabling script injection that can alter page content or behavior, and availability by facilitating attacks like session hijacking or redirecting users to malicious sites. The CVSS v3.1 base score is 7.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction needed, and a scope change indicating that the vulnerability affects components beyond the initially vulnerable part. No known exploits have been reported in the wild, but the presence of this vulnerability in a widely used WordPress theme for conference and event management websites poses a significant risk. The lack of available patches at the time of disclosure necessitates immediate mitigation strategies. The vulnerability is particularly relevant for organizations that rely on this theme for public-facing sites, as attackers can leverage social engineering to trick users into triggering the exploit.

For European organizations, this vulnerability could lead to unauthorized disclosure of user session information, enabling account takeover or impersonation. The injection of malicious scripts can compromise website integrity, leading to defacement or unauthorized actions performed on behalf of users. Availability may be impacted if attackers use the vulnerability to conduct phishing or redirect attacks, damaging organizational reputation and causing service disruption. Organizations in sectors such as event management, education, and professional conferences that use the Grand Conference theme are especially vulnerable. The reflected XSS nature means that attacks can be launched remotely without authentication, increasing the attack surface. Additionally, the scope change in the CVSS vector indicates that the vulnerability can affect components beyond the plugin itself, potentially impacting other integrated systems or plugins. The absence of known exploits currently provides a window for proactive defense, but the high severity score underscores the urgency of remediation.

1. Update the Grand Conference Theme Custom Post Type plugin to version 2.6.4 or later as soon as the patch is released by ThemeGoods. 2. Until a patch is available, implement Web Application Firewall (WAF) rules specifically designed to detect and block reflected XSS attack patterns targeting the affected plugin endpoints. 3. Enforce strict Content Security Policy (CSP) headers to restrict the execution of inline scripts and loading of untrusted resources, mitigating the impact of injected scripts. 4. Conduct regular security audits and penetration testing focusing on input validation and output encoding in all custom post types and theme components. 5. Educate users and administrators about the risks of clicking on suspicious links, especially those related to conference or event invitations. 6. Monitor web server and application logs for unusual request patterns that may indicate attempted exploitation. 7. Consider isolating or disabling the vulnerable plugin functionality if it is not critical to reduce the attack surface. 8. Employ security plugins that provide additional XSS protection and input sanitization for WordPress environments.