CVE-2025-6975 is a reflected Cross-Site Scripting (XSS) vulnerability affecting the WordPress plugin 'Events Manager – Calendar, Bookings, Tickets, and more!' developed by netweblogic. This vulnerability exists in all versions up to and including 7.0.3 due to improper neutralization of input during web page generation, specifically via the 'calendar_header' parameter. The root cause is insufficient input sanitization and output escaping, allowing unauthenticated attackers to inject arbitrary JavaScript code into web pages. When a victim user clicks on a crafted link containing malicious script code in the 'calendar_header' parameter, the injected script executes in the context of the victim's browser session. This can lead to theft of session cookies, redirection to malicious sites, or execution of arbitrary actions on behalf of the user. The vulnerability is exploitable remotely over the network without any authentication but requires user interaction (clicking a malicious link). The CVSS v3.1 base score is 6.1 (medium severity), reflecting the network attack vector, low attack complexity, no privileges required, but requiring user interaction. The scope is changed (S:C), indicating that the vulnerability affects resources beyond the vulnerable component, potentially impacting the confidentiality and integrity of user data. No known exploits are currently reported in the wild, and no official patches have been linked yet. However, given the widespread use of WordPress and the popularity of the Events Manager plugin for managing calendars, bookings, and tickets, this vulnerability poses a significant risk to websites relying on this plugin for event management functionalities.

For European organizations, this vulnerability can have several impacts. Many businesses, cultural institutions, and event organizers in Europe use WordPress with event management plugins to handle bookings and ticketing. Exploitation of this XSS flaw could allow attackers to hijack user sessions, steal sensitive information, or perform actions on behalf of users, potentially leading to data breaches or fraud. This is particularly concerning for organizations handling personal data under GDPR, as unauthorized access or data leakage could result in regulatory penalties and reputational damage. Additionally, attackers could use the vulnerability to deliver further malware or phishing attacks targeting European users. The reflected nature of the XSS means that phishing campaigns could be crafted to exploit trust in legitimate event websites. The impact on availability is minimal, but the confidentiality and integrity of user data and interactions are at risk. Organizations involved in ticket sales, event management, or community engagement across Europe should be aware of this threat and act promptly to mitigate it.

Specific mitigation steps include: 1) Immediate review and update of the Events Manager plugin to the latest version once a patch is released by netweblogic. Until then, consider disabling or removing the plugin if feasible. 2) Implement Web Application Firewall (WAF) rules to detect and block malicious payloads targeting the 'calendar_header' parameter, focusing on typical XSS attack patterns. 3) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on affected web pages, limiting the impact of potential XSS exploitation. 4) Educate users and administrators about the risks of clicking on suspicious links, especially those related to event booking or calendar pages. 5) Conduct thorough input validation and output encoding on all user-controllable parameters in custom code or extensions interacting with the plugin. 6) Monitor web server and application logs for unusual requests containing suspicious script tags or payloads targeting the vulnerable parameter. 7) For organizations with security teams, perform penetration testing focused on XSS vectors in the event management system to identify and remediate similar issues proactively.