CVE-2025-12593 is a vulnerability identified in the Simple Online Hotel Reservation System version 2.0 developed by code-projects. The flaw exists in the Photo Handler component within the /admin/edit_room.php file, where an unrestricted file upload vulnerability allows an attacker to upload arbitrary files remotely. The vulnerability does not require user interaction but does require the attacker to have high-level privileges (authentication with elevated rights) to exploit. The unrestricted upload means that the system does not properly validate or restrict the types or contents of files uploaded, potentially allowing malicious files such as web shells or scripts to be placed on the server. This can lead to further compromise, including unauthorized access, data manipulation, or service disruption. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no user interaction (UI:N), but requires high privileges (PR:H). The impact on confidentiality, integrity, and availability is low to limited, reflecting the need for elevated privileges and the absence of direct remote unauthenticated exploitation. No public patches or known exploits in the wild are currently reported, but the exploit code is publicly available, increasing the risk of future attacks. The vulnerability is classified as medium severity with a CVSS score of 5.1.

For European organizations, especially those in the hospitality sector using the affected Simple Online Hotel Reservation System 2.0, this vulnerability poses a risk of unauthorized file uploads by malicious insiders or attackers who have gained elevated access. The impact includes potential deployment of malicious scripts or web shells that could lead to data breaches, unauthorized data modification, or service disruptions. While the vulnerability requires high privileges, compromised administrative accounts or insider threats could exploit it to escalate attacks. This could affect customer data confidentiality and system integrity, impacting trust and regulatory compliance, particularly under GDPR. The availability of the system could also be affected if attackers upload files that disrupt normal operations. Given the hospitality industry's importance in Europe, any disruption or breach could have significant reputational and financial consequences.

To mitigate CVE-2025-12593, organizations should implement strict server-side validation of uploaded files, including checking file types, sizes, and content signatures to prevent malicious uploads. Restrict upload permissions to only necessary administrative users and enforce strong authentication and authorization controls to limit high privilege access. Employ web application firewalls (WAFs) to detect and block suspicious upload attempts. Regularly audit and monitor upload directories for unauthorized or unexpected files. If possible, isolate upload directories from executable permissions to prevent execution of uploaded files. Apply the principle of least privilege to all administrative accounts and consider multi-factor authentication (MFA) to reduce the risk of credential compromise. Since no official patch is currently available, consider temporary compensating controls such as disabling the upload functionality if not critical or using network segmentation to limit exposure. Stay updated on vendor advisories for patches or updates addressing this vulnerability.