CVE-2025-60306 identifies a permission bypass vulnerability in version 1.0 of the Simple Car Rental System, a software product designed to manage car rental operations. The vulnerability allows users with low privilege accounts to forge sessions that appear to have high privilege, effectively bypassing the intended access control mechanisms. This session forgery enables unauthorized users to perform sensitive operations that should be restricted to administrators or other privileged roles. The root cause likely involves inadequate session management and insufficient validation of user privileges during session creation or operation execution. No CVSS score has been assigned yet, and no patches or known exploits have been reported as of the publication date. However, the vulnerability's nature suggests it could be exploited remotely by authenticated users without requiring complex user interaction. The lack of proper privilege enforcement can lead to unauthorized data access, modification, or even administrative control over the system, compromising confidentiality, integrity, and potentially availability if critical operations are affected. The Simple Car Rental System is typically deployed in small to medium-sized rental businesses, which may not have robust security practices, increasing the risk of exploitation.

For European organizations, the impact of this vulnerability can be significant, especially for those in the car rental and transportation sectors using the affected software or similar systems. Unauthorized privilege escalation could lead to exposure of sensitive customer data, manipulation of rental records, fraudulent transactions, or disruption of business operations. This could result in financial losses, reputational damage, and regulatory penalties under GDPR due to data breaches. The vulnerability may also serve as a foothold for attackers to pivot into broader network environments if the system is connected to other critical infrastructure. Small and medium enterprises (SMEs) in Europe, which often rely on off-the-shelf software with limited security hardening, are particularly vulnerable. The absence of known exploits currently provides a window for proactive mitigation before widespread attacks occur.

To mitigate this vulnerability, organizations should first verify if they are using the Simple Car Rental System 1.0 or similar vulnerable versions. Since no official patches are available, immediate steps include implementing strict session management controls, such as regenerating session tokens upon privilege changes and validating user roles on every sensitive operation. Employing web application firewalls (WAFs) to detect and block suspicious session manipulation attempts can provide additional protection. Conducting thorough access control reviews and enforcing the principle of least privilege will reduce the attack surface. Monitoring logs for unusual session activity or privilege escalations can help detect exploitation attempts early. Organizations should also engage with the software vendor for updates or consider migrating to more secure alternatives. Finally, educating staff about the risks of privilege escalation and maintaining strong authentication mechanisms will further reduce exposure.