CVE-2025-54853: MedDream PACS Premium XSS Vulnerability

CVE-2025-54853 Overview

A reflected cross-site scripting (XSS) vulnerability has been identified in the modifyUser functionality of MedDream PACS Premium 7.3.6.870. This vulnerability allows attackers to execute arbitrary JavaScript code in the context of a victim's browser session by crafting a malicious URL. When a user clicks on the specially crafted link, the injected script executes with the privileges of the authenticated user, potentially leading to session hijacking, data theft, or further compromise of the medical imaging system.

MedDream PACS (Picture Archiving and Communication System) is widely used in healthcare environments for managing and viewing medical images. The exploitation of this vulnerability in a healthcare setting could have serious implications for patient data confidentiality and system integrity.

Critical Impact

Attackers can execute arbitrary JavaScript code in authenticated user sessions, potentially compromising sensitive medical imaging data and administrative functions within healthcare environments.

Affected Products

• MedDream PACS Premium 7.3.6.870

Discovery Timeline

• 2026-01-20 - CVE-2025-54853 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-54853

Vulnerability Analysis

This reflected XSS vulnerability exists within the modifyUser functionality of MedDream PACS Premium. The application fails to properly sanitize user-supplied input before reflecting it back in the HTTP response. When a victim clicks on a malicious URL containing JavaScript payload, the unsanitized input is rendered in the browser, causing the malicious script to execute within the security context of the affected web application.

The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which represents one of the most common web application security flaws. In this case, user-controlled input is incorporated into dynamic web content without proper encoding or validation, allowing attackers to inject client-side scripts.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the modifyUser functionality. The application accepts user-supplied parameters and reflects them directly into the HTML response without applying appropriate sanitization or encoding mechanisms. This allows specially crafted input containing JavaScript code to be interpreted and executed by the victim's browser.

Attack Vector

The attack vector for this vulnerability is network-based and requires user interaction. An attacker must craft a malicious URL containing the XSS payload targeting the modifyUser functionality and convince an authenticated user to click on the link. This is typically accomplished through phishing emails, social engineering, or embedding the malicious link in compromised websites.

Once clicked, the malicious JavaScript executes in the context of the victim's authenticated session, potentially allowing the attacker to:

• Steal session cookies and authentication tokens
• Perform actions on behalf of the authenticated user
• Access sensitive patient data and medical images
• Modify user accounts or system configurations
• Redirect users to malicious websites

The vulnerability requires no privileges for the attacker to exploit, but does require a victim with an active session to interact with the malicious URL.

Detection Methods for CVE-2025-54853

Indicators of Compromise

• Unusual or malformed URLs containing JavaScript code targeting the modifyUser endpoint
• Unexpected script execution or browser behavior when accessing MedDream PACS user management functions
• Web server logs showing requests to modifyUser with suspicious URL parameters containing encoded script tags or JavaScript event handlers
• Reports of users being redirected to unexpected pages or experiencing unusual prompts while using the PACS system

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing common XSS payloads targeting the modifyUser functionality
• Monitor web server access logs for patterns indicative of XSS attacks, such as <script>, javascript:, onerror=, or other common injection patterns in URL parameters
• Deploy browser-based security controls and Content Security Policy (CSP) headers to detect and prevent unauthorized script execution
• Utilize intrusion detection systems (IDS) with signatures for reflected XSS attack patterns

Monitoring Recommendations

• Enable detailed logging for all user management operations within MedDream PACS
• Implement real-time alerting for web requests containing potential XSS payloads or unusual character sequences
• Monitor for anomalous user session behavior that may indicate session hijacking following successful XSS exploitation
• Review authentication logs for suspicious login patterns or session token reuse from unexpected IP addresses

How to Mitigate CVE-2025-54853

Immediate Actions Required

• Review and restrict access to the MedDream PACS administrative interface to trusted networks only
• Implement Content Security Policy (CSP) headers to prevent inline script execution
• Deploy a web application firewall (WAF) with XSS protection rules in front of the MedDream PACS server
• Educate users about phishing risks and the importance of not clicking on suspicious links

Patch Information

Organizations should monitor MedDream for official security updates addressing this vulnerability. Contact the vendor directly for patch availability and upgrade guidance. For detailed technical information, refer to the Talos Intelligence Vulnerability Report.

Workarounds

• Restrict network access to MedDream PACS to internal trusted networks using firewall rules or VPN requirements
• Implement browser security extensions that block suspicious script execution for users accessing the PACS system
• Deploy a reverse proxy with input validation and output encoding capabilities to sanitize requests before they reach the application
• Configure HTTP security headers including X-XSS-Protection, X-Content-Type-Options, and strict Content-Security-Policy directives

# Example Apache configuration for security headers
<IfModule mod_headers.c>
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'"
    Header set X-Frame-Options "SAMEORIGIN"
</IfModule>