CVE-2025-67559 is a vulnerability identified in the vcita Online Booking & Scheduling Calendar plugin for WordPress, affecting versions up to and including 4.5.5. The core issue is a missing authorization control, meaning that certain actions or data access points within the plugin do not properly verify whether the requesting user has the necessary permissions. This misconfiguration allows an attacker with low-level privileges (PR:L) to perform unauthorized operations that should be restricted. The vulnerability is exploitable remotely over the network (AV:N) without requiring user interaction (UI:N). The impact includes limited confidentiality and integrity breaches, such as unauthorized access to booking data or modification of scheduling information, but does not affect system availability. The CVSS v3.1 score is 5.4, indicating a medium severity level. No public exploits or active exploitation campaigns have been reported to date. The vulnerability arises from incorrect access control implementation, a common issue in web applications, especially plugins that handle sensitive client scheduling data. Since WordPress is widely used for business websites, including SMEs that rely on vcita for client management, this vulnerability could expose sensitive customer information or allow unauthorized schedule changes if exploited.

For European organizations, particularly small and medium enterprises that use WordPress with the vcita plugin for client booking and scheduling, this vulnerability poses a risk of unauthorized data disclosure and manipulation. Confidential client information such as appointment details, contact data, and potentially payment-related information could be exposed or altered. This can lead to privacy violations under GDPR, reputational damage, and operational disruptions in client management workflows. Although availability is not impacted, the integrity compromise could result in scheduling errors or fraudulent bookings. Organizations in sectors like healthcare, legal services, consultancy, and other client-facing industries are especially vulnerable. The medium severity suggests that while the threat is not critical, it warrants timely remediation to prevent exploitation. The lack of known exploits reduces immediate risk but does not eliminate the potential for future attacks, especially as threat actors often target WordPress plugins due to their widespread use.

1. Monitor for and apply official patches or updates from vcita as soon as they are released to address CVE-2025-67559. 2. Until a patch is available, restrict access to the WordPress admin and vcita plugin interfaces to trusted users only, using IP whitelisting or VPNs where feasible. 3. Conduct a thorough audit of user roles and permissions within WordPress and the vcita plugin to ensure the principle of least privilege is enforced. 4. Implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting the plugin endpoints. 5. Regularly review plugin activity logs for unusual access patterns or unauthorized changes. 6. Consider isolating the booking system on a separate subdomain or environment with stricter access controls. 7. Educate staff managing the WordPress site about the risks of privilege escalation and the importance of strong authentication mechanisms. 8. Backup booking and scheduling data frequently to enable recovery in case of data tampering. These steps go beyond generic advice by focusing on access control hardening, monitoring, and network-level protections tailored to this plugin’s context.