CVE-2025-39390 is a Missing Authorization vulnerability (CWE-862) identified in the magepeopleteam Booking and Rental Manager software, affecting versions up to 2.3.8. This vulnerability arises because certain functionality within the application is not properly constrained by Access Control Lists (ACLs), allowing unauthorized users to access features or perform actions that should be restricted. Specifically, the flaw means that the system fails to verify whether a user has the appropriate permissions before granting access to sensitive functions. This can lead to privilege escalation or unauthorized data manipulation. The vulnerability does not require user interaction or authentication, implying that an attacker could potentially exploit it remotely if the affected service is exposed. Although no known exploits are currently observed in the wild, the lack of proper authorization checks represents a significant security weakness that could be leveraged to compromise the confidentiality, integrity, and availability of the booking and rental management system. The absence of a patch at the time of reporting increases the urgency for organizations to implement compensating controls. Given the nature of the product, which is typically used by businesses managing bookings and rentals, exploitation could lead to unauthorized access to customer data, manipulation of booking records, or disruption of service operations.

For European organizations, the impact of this vulnerability could be substantial, especially for companies in the hospitality, car rental, property rental, and event management sectors that rely on magepeopleteam Booking and Rental Manager. Unauthorized access could lead to exposure of personally identifiable information (PII) of customers, violating GDPR requirements and potentially resulting in regulatory fines and reputational damage. Integrity of booking data could be compromised, causing operational disruptions, financial losses, and customer dissatisfaction. Availability could also be affected if attackers manipulate or disable booking functionalities. Since the vulnerability allows access to functionality without proper authorization, attackers might escalate privileges or perform unauthorized transactions, impacting business continuity. The medium severity rating indicates a moderate level of risk, but the real-world impact depends on the deployment context and exposure of the affected systems. Organizations with internet-facing instances of this software are at higher risk. Additionally, the lack of known exploits suggests that proactive mitigation can prevent exploitation before widespread attacks occur.

Given the absence of an official patch, European organizations should implement the following specific mitigation strategies: 1) Restrict network access to the Booking and Rental Manager application by implementing strict firewall rules and network segmentation to limit exposure to trusted internal users only. 2) Employ Web Application Firewalls (WAFs) with custom rules to detect and block unauthorized access attempts targeting the vulnerable functionality. 3) Conduct thorough access reviews and tighten role-based access controls (RBAC) within the application to minimize permissions granted to users and service accounts. 4) Monitor application logs and user activity for unusual access patterns or attempts to invoke restricted functions. 5) If possible, disable or restrict access to non-essential features that are known or suspected to be affected by the missing authorization until a patch is available. 6) Engage with magepeopleteam for updates and prioritize patch deployment once released. 7) Consider deploying intrusion detection/prevention systems (IDS/IPS) tuned to detect exploitation attempts. 8) Educate staff about the risks and ensure incident response plans are updated to handle potential exploitation scenarios.