CVE-2025-52801 is a high-severity vulnerability identified in VonStroheim's TheBooking software, versions up to 1.4.4. The vulnerability is classified under CWE-862, which pertains to Missing Authorization. This means that certain functionalities within TheBooking are accessible without proper Access Control List (ACL) enforcement, allowing unauthorized users to perform actions or access data that should be restricted. The vulnerability has a CVSS 3.1 base score of 7.3, indicating a high level of risk. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) reveals that the attack can be executed remotely over the network without any privileges or user interaction, making exploitation relatively straightforward. The impact affects confidentiality, integrity, and availability to a low to moderate degree, as unauthorized access could lead to information disclosure, unauthorized modifications, or disruption of service. TheBooking is a booking management system, likely used by organizations to handle reservations, appointments, or resource scheduling. Missing authorization in such a system can lead to unauthorized data access or manipulation, potentially exposing sensitive customer or operational data and disrupting business processes. No patches or known exploits in the wild have been reported yet, but the vulnerability's nature and ease of exploitation make it a significant risk if left unaddressed.

For European organizations using TheBooking software, this vulnerability poses a considerable threat. Unauthorized access to booking data could lead to exposure of personal data protected under GDPR, resulting in regulatory penalties and reputational damage. Integrity compromise could allow attackers to alter bookings or schedules, causing operational disruptions, financial losses, or customer dissatisfaction. Availability impact, while rated low to moderate, could still affect service continuity, especially for organizations heavily reliant on automated booking systems, such as hotels, healthcare providers, or event organizers. The lack of required privileges or user interaction for exploitation increases the risk of automated or large-scale attacks, potentially affecting multiple organizations simultaneously. Given the sensitivity of booking data and the critical role of scheduling in many sectors, the vulnerability could also be leveraged for targeted attacks or lateral movement within networks.

Organizations should immediately assess their use of TheBooking software and verify the version in deployment. Since no official patches are currently available, temporary mitigations include restricting network access to the TheBooking application to trusted internal IPs or VPN users only, thereby reducing exposure to remote attackers. Implementing Web Application Firewalls (WAFs) with rules to detect and block unauthorized access attempts can provide additional protection. Conduct thorough access reviews and monitor logs for unusual access patterns or unauthorized functionality usage. Organizations should engage with VonStroheim for timelines on patch releases and apply updates promptly once available. Additionally, consider implementing compensating controls such as multi-factor authentication around the booking system's access points and segregating the booking system network segment to limit potential lateral movement. Regular security audits and penetration testing focused on authorization controls can help identify and remediate similar issues proactively.