CVE-2026-3800 in Resort Reservation System
Summary
by MITRE • 03/09/2026
A vulnerability has been found in SourceCodester/janobe Resort Reservation System 1.0. Affected is the function doInsert of the file /controller.php?action=add. Such manipulation of the argument image leads to unrestricted upload. The attack can be executed remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 03/09/2026
This vulnerability exists within the janobe Resort Reservation System version 1.0, specifically in the doInsert function located in the /controller.php file at the /action=add endpoint. The flaw stems from inadequate input validation and sanitization mechanisms that fail to properly restrict file uploads, particularly when processing the image argument parameter. The vulnerability classifies as an unrestricted file upload issue that allows remote attackers to execute arbitrary code through malicious file uploads. This represents a critical security weakness that directly violates multiple security standards including CWE-434 which addresses insecure file upload handling and CWE-94 which covers improper control of generation of code. The vulnerability enables attackers to bypass normal file type restrictions and upload potentially malicious files such as web shells or executable scripts.
The technical implementation of this vulnerability occurs when the application processes the image parameter without enforcing strict file type validation or content inspection. Attackers can manipulate the image argument to upload files with extensions that should be restricted, such as .php, .asp, or .jsp, which can then be executed on the web server. The remote execution capability means that attackers do not need physical access to the system and can exploit this through web-based interfaces. This vulnerability aligns with ATT&CK technique T1190 which describes exploits for execution through web shells and T1203 which covers exploitation for privilege escalation. The lack of proper file validation creates an attack surface where malicious files can be uploaded and subsequently executed, potentially leading to complete system compromise.
The operational impact of this vulnerability is severe and multifaceted. Remote code execution capabilities allow attackers to gain unauthorized access to the web server, potentially leading to data breaches, system compromise, and complete loss of control over the affected application. The unrestricted upload capability can result in persistent backdoors being established, making it difficult for administrators to detect and remove malicious files. Organizations using this system face significant risk of data exfiltration, service disruption, and potential regulatory violations due to the exposure of sensitive guest information that would typically be stored in such reservation systems. The vulnerability also creates opportunities for attackers to use the compromised system as a launch point for further attacks within the network infrastructure.
Mitigation strategies should include immediate implementation of strict file type validation and content inspection mechanisms. The application should enforce whitelisting of allowed file extensions and MIME types while performing thorough content analysis to detect malicious file characteristics. Input sanitization should be implemented at multiple layers including client-side and server-side validation to prevent bypass attempts. Network segmentation and access controls should be strengthened to limit the potential impact of successful exploitation. Regular security updates and patches should be applied to address known vulnerabilities, and comprehensive monitoring should be implemented to detect suspicious file upload activities. Organizations should also consider implementing web application firewalls and intrusion detection systems to identify and block malicious upload attempts. The implementation of proper authentication and authorization controls, along with regular security audits, will help prevent unauthorized access to the upload functionality. Additionally, the system should be configured to store uploaded files outside the web root directory to prevent direct execution of uploaded content, following security best practices outlined in OWASP top ten and NIST cybersecurity frameworks.