CVE-2025-52730 is a stored Cross-site Scripting (XSS) vulnerability classified under CWE-79, affecting the WordPress Event Manager, Event Calendar and Booking Plugin developed by themefunction. This vulnerability arises due to improper neutralization of input during web page generation, allowing malicious scripts to be injected and stored within the plugin's data. When a user accesses a page containing the malicious payload, the script executes in the context of the victim's browser. The affected versions include all versions up to 4.0.24. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) reveals that the attack can be launched remotely over the network with low attack complexity, requires privileges (PR:L) on the system, and user interaction (UI:R) to trigger the exploit. The scope is changed (S:C), meaning the vulnerability affects resources beyond the security scope of the vulnerable component. The impact affects confidentiality, integrity, and availability to a limited extent. No known exploits are currently reported in the wild, and no patches have been linked yet. Stored XSS vulnerabilities in WordPress plugins are particularly dangerous because they can be used to hijack user sessions, deface websites, or deliver malware to site visitors. Given the plugin's role in managing events and bookings, attackers could inject malicious scripts into event descriptions or booking forms, impacting administrators and end-users alike.

For European organizations using the WordPress Event Manager, Event Calendar and Booking Plugin, this vulnerability poses a significant risk to website integrity and user trust. Attackers exploiting this stored XSS could steal session cookies, leading to account takeover of administrative or user accounts, potentially exposing sensitive personal data or business information. The integrity of event data and booking information could be compromised, affecting operational continuity and customer confidence. Additionally, the availability impact, while limited, could manifest through denial-of-service conditions caused by malicious scripts. Organizations in sectors such as event management, hospitality, education, and public services that rely on this plugin for scheduling and booking are particularly vulnerable. The requirement for some level of privilege to exploit means internal threat actors or compromised accounts could be leveraged to launch attacks, increasing the risk from insider threats or phishing campaigns. The cross-site scripting nature also means that visitors to affected websites could be targeted, broadening the scope of impact beyond the organization itself.

1. Immediate review and application of any forthcoming patches or updates from themefunction for the Event Manager, Event Calendar and Booking Plugin is critical. 2. Implement strict input validation and output encoding on all user-supplied data fields within the plugin, especially those related to event descriptions and booking forms. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers accessing the affected sites. 4. Limit user privileges rigorously to reduce the risk of privilege escalation and exploitation by authenticated users. 5. Conduct regular security audits and penetration testing focused on plugin components to detect similar vulnerabilities proactively. 6. Monitor web server and application logs for unusual activities indicative of attempted XSS exploitation. 7. Educate administrative users about phishing and social engineering risks that could lead to account compromise, which is a prerequisite for exploitation. 8. Consider deploying Web Application Firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting this plugin. 9. If feasible, temporarily disable or replace the plugin with alternative solutions until a secure version is available.