CVE-2025-11103 is a medium-severity security vulnerability identified in version 1.0 of Projectworlds' Online Tours and Travels application. The vulnerability exists in the /admin/change-image.php file, specifically in the handling of the 'packageimage' argument. This flaw allows an attacker to perform an unrestricted file upload remotely without requiring user interaction or authentication, as indicated by the CVSS vector (AV:N/AC:L/AT:N/PR:H/UI:N). The vulnerability permits an attacker with high privileges (PR:H) to upload arbitrary files to the server, potentially leading to remote code execution or unauthorized modification of server files. The CVSS score of 5.1 reflects a medium impact primarily due to the requirement of high privileges for exploitation, limited confidentiality, integrity, and availability impact, and no user interaction needed. Although no public exploits are currently known to be in the wild, the vulnerability has been publicly disclosed, increasing the risk of exploitation. The lack of patches or mitigation links suggests that the vendor has not yet released an official fix, making timely remediation critical. The unrestricted upload vulnerability can be leveraged to upload malicious scripts or web shells, which could compromise the server, escalate privileges, or pivot to other internal systems. Given the administrative context of the vulnerable script, the attack surface is limited to users with elevated access, but the consequences of exploitation remain significant for the affected system's security posture.

For European organizations using Projectworlds Online Tours and Travels version 1.0, this vulnerability poses a tangible risk of server compromise through unauthorized file uploads. Since exploitation requires high privileges, the immediate threat is primarily to organizations with weak internal access controls or compromised administrative accounts. Successful exploitation could lead to unauthorized code execution, data breaches, defacement, or service disruption, impacting confidentiality, integrity, and availability of the affected systems. Tourism and travel companies in Europe relying on this software could face operational disruptions, reputational damage, and regulatory consequences under GDPR if customer data is exposed. Additionally, attackers could leverage the compromised servers as footholds for lateral movement within corporate networks. The medium severity rating suggests that while the vulnerability is not trivial, it is not easily exploitable by external attackers without prior access, somewhat limiting its impact. However, the public disclosure increases the urgency for European organizations to assess and mitigate this risk promptly to prevent potential exploitation.

European organizations should immediately audit and restrict administrative access to the Projectworlds Online Tours and Travels application, ensuring that only trusted personnel have high privilege accounts. Implement strict access controls and multi-factor authentication for administrative interfaces to reduce the risk of credential compromise. Since no official patch is currently available, organizations should consider temporary mitigations such as disabling or restricting access to the /admin/change-image.php endpoint, implementing web application firewall (WAF) rules to detect and block suspicious file upload attempts, and validating or sanitizing uploaded files at the application or server level to prevent execution of malicious payloads. Regularly monitor server logs and file system changes for indicators of compromise. Organizations should also engage with the vendor for updates on patch availability and apply fixes promptly once released. Conducting internal penetration testing focused on file upload functionalities can help identify similar weaknesses. Finally, maintaining robust network segmentation can limit the impact of a potential compromise.