CVE-2026-6602: Hospital Management System RCE Vulnerability

CVE-2026-6602 Overview

A critical unrestricted file upload vulnerability has been identified in the rickxy Hospital Management System. The vulnerability exists in the /backend/admin/his_admin_account.php file, where manipulation of the ad_dpic parameter allows attackers to upload arbitrary files without proper validation. This flaw can be exploited remotely, enabling potential attackers to upload malicious files that could lead to remote code execution, system compromise, or data theft within healthcare environments.

Critical Impact

Remote attackers can exploit the unrestricted file upload vulnerability to upload malicious files, potentially leading to complete system compromise of hospital management systems containing sensitive patient data.

Affected Products

• rickxy Hospital Management System (up to commit 88a4290d957dc5bdde8a56e5ad451ad14f7f90f4)

Discovery Timeline

• April 20, 2026 - CVE-2026-6602 published to NVD
• April 22, 2026 - Last updated in NVD database

Technical Details for CVE-2026-6602

Vulnerability Analysis

This vulnerability is classified under CWE-284 (Improper Access Control), specifically manifesting as an unrestricted file upload vulnerability in the hospital management system's administrative interface. The affected function handles profile picture uploads for admin accounts but fails to implement proper file type validation, size restrictions, or content verification.

The network-accessible nature of this vulnerability means attackers can target the system without requiring prior authentication or local access. The exploit has been publicly disclosed, increasing the risk of widespread exploitation against vulnerable installations. Healthcare systems are particularly sensitive targets due to the presence of protected health information (PHI) and critical operational data.

Root Cause

The root cause lies in improper input validation within the /backend/admin/his_admin_account.php file. The ad_dpic parameter, intended for admin display picture uploads, lacks proper sanitization and file type restrictions. The application fails to:

• Validate file extensions against an allowlist
• Verify file content (MIME type verification)
• Implement proper access controls on the upload functionality
• Sanitize uploaded filenames to prevent path traversal

Attack Vector

The vulnerability is exploitable via network access without requiring authentication. An attacker can craft a malicious HTTP request to the vulnerable endpoint, manipulating the ad_dpic parameter to upload arbitrary files. The attack flow involves sending a multipart form request to the admin account management endpoint, bypassing any client-side validation that may be present.

Since the product uses a rolling release model, specific version boundaries are unavailable, making it difficult to determine which deployments are affected. Organizations should review their commit history against the affected commit hash 88a4290d957dc5bdde8a56e5ad451ad14f7f90f4 to assess their exposure.

The vulnerability mechanism involves sending crafted file upload requests to the vulnerable PHP endpoint. Without proper server-side validation, the application accepts and stores files regardless of their type or content, potentially allowing web shells or other malicious scripts to be uploaded and subsequently executed. For detailed technical analysis, refer to the GitHub Issue on CVE and VulDB Entry #358237.

Detection Methods for CVE-2026-6602

Indicators of Compromise

• Unexpected files with executable extensions (.php, .phtml, .asp) appearing in upload directories
• HTTP POST requests to /backend/admin/his_admin_account.php with suspicious ad_dpic parameters
• Web server logs showing access to newly uploaded files in admin profile directories
• Unusual outbound network connections originating from the web server process

Detection Strategies

• Monitor HTTP traffic for multipart form uploads to the vulnerable endpoint containing non-image file types
• Implement file integrity monitoring on web application directories to detect unauthorized file creation
• Deploy web application firewall (WAF) rules to inspect and block suspicious file upload attempts
• Review web server access logs for patterns consistent with web shell access or exploitation attempts

Monitoring Recommendations

• Enable detailed logging on the Hospital Management System application server
• Configure alerts for new file creation events in web-accessible directories
• Monitor for POST requests to /backend/admin/his_admin_account.php with large payloads or unusual content types
• Implement network traffic analysis to detect command and control communications from compromised systems

How to Mitigate CVE-2026-6602

Immediate Actions Required

• Restrict network access to the administrative backend (/backend/admin/) to trusted IP ranges only
• Implement additional authentication controls for admin account management functions
• Review and remove any suspicious files from upload directories immediately
• Consider temporarily disabling the profile picture upload functionality until patches are applied

Patch Information

As this product uses a rolling release model, version-specific patch information is not available. Organizations should monitor the rickxy Hospital Management System repository for updates addressing this vulnerability. Ensure your deployment is updated beyond commit 88a4290d957dc5bdde8a56e5ad451ad14f7f90f4 once a fix is available.

Workarounds

• Implement server-side file type validation using allowlists (restrict to image formats only: .jpg, .png, .gif)
• Configure the web server to prevent script execution in upload directories using .htaccess or equivalent configurations
• Deploy a web application firewall (WAF) with rules to block malicious file upload attempts
• Rename uploaded files using random identifiers and store them outside the web root when possible

# Apache configuration to prevent script execution in upload directories
# Add to .htaccess in the upload directory
<Directory /path/to/upload/directory>
    # Disable script execution
    php_flag engine off
    
    # Deny access to specific file types
    <FilesMatch "\.(php|phtml|php3|php4|php5|pl|py|jsp|asp|htm|html|shtml|sh|cgi)$">
        Require all denied
    </FilesMatch>
    
    # Only allow specific image types
    <FilesMatch "\.(?i)(jpg|jpeg|gif|png|webp)$">
        Require all granted
    </FilesMatch>
</Directory>