CVE-2025-39398 is a Missing Authorization vulnerability (CWE-862) identified in the Themovation Hotel + Bed and Breakfast Booking Calendar Theme, known as Bellevue, affecting versions up to 4.2.2. This vulnerability arises due to insufficient authorization checks within the theme's code, allowing an authenticated user with limited privileges (low privilege) to perform actions or access resources beyond their intended permissions. The CVSS 3.1 base score is 4.3, indicating a medium severity level. The vector details show that the attack can be performed remotely over the network (AV:N), requires low complexity (AC:L), and requires privileges (PR:L) but no user interaction (UI:N). The impact is limited to integrity (I:L) with no confidentiality or availability impact. This means an attacker with some level of access could potentially modify data or booking information without proper authorization controls, but cannot disrupt service or access confidential data directly. No known exploits are currently in the wild, and no patches have been linked yet. The vulnerability was reserved in April 2025 and published in May 2025, indicating it is a recent discovery. The theme is typically used by hotels and bed and breakfast establishments to manage booking calendars on WordPress sites, making it a critical component for hospitality businesses relying on this software for online reservations.

For European organizations, particularly those in the hospitality sector using the Bellevue booking calendar theme, this vulnerability could lead to unauthorized modification of booking data, potentially causing operational disruptions, double bookings, or fraudulent reservations. While the confidentiality of customer data is not directly impacted, the integrity compromise could undermine trust in the booking system and lead to financial losses or reputational damage. Since the vulnerability requires low privileges but authenticated access, attackers might exploit compromised or weak user credentials to escalate their capabilities within the booking system. This could be particularly impactful for small to medium-sized hotels and B&Bs that may lack robust cybersecurity measures. Additionally, any disruption or manipulation of booking data could indirectly affect availability if it leads to operational confusion or customer dissatisfaction. Given the hospitality industry's importance in Europe’s tourism economy, even medium-severity vulnerabilities can have outsized consequences.

Organizations should immediately audit user roles and permissions within their WordPress installations using the Bellevue theme to ensure the principle of least privilege is enforced. Restrict access to booking management functions strictly to trusted users. Implement multi-factor authentication (MFA) for all accounts with booking management privileges to reduce the risk of credential compromise. Monitor logs for unusual booking modifications or access patterns indicative of exploitation attempts. Since no official patch is currently available, consider temporarily disabling or restricting access to the vulnerable booking calendar features if feasible. Engage with Themovation or theme vendors to obtain updates or patches as soon as they are released. Additionally, conduct regular security assessments and penetration testing focused on authorization controls within the booking system. Employ web application firewalls (WAFs) with custom rules to detect and block unauthorized attempts to access or modify booking data. Finally, maintain regular backups of booking data to enable recovery in case of data integrity issues.