CVE-2024-30516 is a vulnerability classified under CWE-1284, indicating improper validation of specified quantity inputs within the SaasProject Booking Package. The core issue arises because the application fails to properly enforce Access Control Lists (ACLs) on certain functionalities related to booking quantities, allowing unauthorized users to access or manipulate features that should be restricted. This can lead to unauthorized modification of booking data or operations, potentially affecting the integrity of the system. The vulnerability affects all versions up to 1.6.27. The CVSS 3.1 base score of 7.5 reflects a high severity, with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact is primarily on integrity (I:H), with no direct confidentiality or availability impact. The vulnerability is exploitable remotely without authentication, increasing its risk profile. Although no public exploits have been reported yet, the flaw could be leveraged by attackers to bypass booking restrictions or manipulate booking quantities, potentially causing financial or operational damage. The lack of available patches at the time of publication necessitates immediate attention to access control and input validation in affected deployments.

For European organizations, especially those in sectors relying heavily on booking systems such as travel agencies, hotels, event organizers, and transportation services, this vulnerability poses a significant risk. Unauthorized manipulation of booking quantities or related operations can lead to financial losses, operational disruptions, and reputational damage. Attackers could exploit this flaw to create fraudulent bookings, cancel legitimate reservations, or otherwise interfere with service integrity. Given the network-exploitable nature without authentication, attackers could target exposed booking systems remotely, increasing the threat surface. The integrity compromise could also affect downstream systems relying on booking data, causing cascading operational issues. Additionally, regulatory compliance risks may arise if manipulated data leads to breaches of consumer protection or data integrity standards under European laws such as GDPR.

Organizations should immediately audit their SaasProject Booking Package implementations to identify if they are running affected versions (up to 1.6.27). Since no official patches are currently available, temporary mitigations include: 1) Implementing strict network-level access controls to restrict exposure of booking system interfaces to trusted internal networks or VPNs. 2) Enhancing input validation on quantity and related parameters at the application and API layers to reject out-of-bound or suspicious values. 3) Reviewing and tightening ACL configurations to ensure that all sensitive functions require proper authorization checks. 4) Monitoring logs and booking activity for anomalies such as unexpected quantity changes or unauthorized function access attempts. 5) Engaging with the vendor or community for updates or patches and planning prompt deployment once available. 6) Considering compensating controls such as multi-factor authentication for administrative access and rate limiting to reduce exploitation likelihood. 7) Conducting penetration testing focused on ACL bypass and input validation to identify residual weaknesses.