CVE-2025-54157: MedDream PACS Premium XSS Vulnerability

CVE-2025-54157 Overview

A reflected cross-site scripting (XSS) vulnerability exists in the encapsulatedDoc 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, credential theft, or unauthorized actions within the medical imaging system.

Critical Impact

Healthcare environments utilizing MedDream PACS Premium for medical image viewing and management are at risk. Successful exploitation could compromise patient data confidentiality and enable attackers to perform unauthorized operations within the PACS system.

Affected Products

• MedDream PACS Premium 7.3.6.870

Discovery Timeline

• 2026-01-20 - CVE CVE-2025-54157 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-54157

Vulnerability Analysis

This reflected XSS vulnerability (CWE-79) exists in the encapsulatedDoc functionality of MedDream PACS Premium. The application fails to properly sanitize user-supplied input before reflecting it back in the HTTP response, allowing malicious JavaScript code to be injected and executed in the victim's browser. As a healthcare imaging system, MedDream PACS handles sensitive patient data, making this vulnerability particularly concerning from a compliance and data protection standpoint. The vulnerability requires user interaction, meaning an attacker must convince a victim to click on a crafted URL to trigger the exploit.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the encapsulatedDoc functionality. When processing URL parameters, the application fails to properly sanitize special characters and JavaScript code, allowing them to be reflected directly into the page output without proper encoding. This lack of defense-in-depth against XSS attacks enables attackers to inject malicious scripts that execute in the security context of the target domain.

Attack Vector

The attack is network-based and requires user interaction. An attacker crafts a malicious URL containing JavaScript payload in the vulnerable parameter and delivers it to the victim through phishing emails, malicious links on websites, or social engineering. When the victim clicks the link while authenticated to the MedDream PACS system, the malicious script executes with their session privileges.

The exploitation mechanism involves embedding JavaScript code within URL parameters that get reflected in the page response. When rendered by the victim's browser, this code executes and can perform actions such as stealing session cookies, capturing keystrokes, or redirecting users to phishing pages. For detailed technical information, refer to the Talos Intelligence Vulnerability Report.

Detection Methods for CVE-2025-54157

Indicators of Compromise

• Unusual URL patterns containing JavaScript code or encoded script tags in requests to the encapsulatedDoc endpoint
• Web server logs showing requests with suspicious URL-encoded characters such as %3Cscript%3E or event handlers like onerror, onload
• User reports of unexpected browser behavior or redirects when accessing MedDream PACS links

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block common XSS payloads targeting the encapsulatedDoc functionality
• Monitor HTTP access logs for requests containing suspicious JavaScript patterns or encoded script elements
• Deploy browser-based security controls that can detect and prevent reflected XSS attacks
• Utilize intrusion detection systems (IDS) with signatures for XSS attack patterns

Monitoring Recommendations

• Enable verbose logging on web servers hosting MedDream PACS Premium to capture full request URLs
• Set up alerting for anomalous patterns in HTTP request parameters, particularly those containing script tags or event handlers
• Monitor user session activity for signs of session hijacking or unauthorized actions following suspicious URL access

How to Mitigate CVE-2025-54157

Immediate Actions Required

• Review and restrict access to MedDream PACS Premium to trusted networks and users only
• Educate users about the risks of clicking on untrusted links, especially those leading to the PACS system
• Implement Content Security Policy (CSP) headers to mitigate the impact of XSS attacks
• Deploy web application firewall rules to filter malicious input targeting the encapsulatedDoc functionality

Patch Information

Organizations should monitor MedDream for security updates addressing this vulnerability. Contact the vendor directly for patch availability and upgrade instructions. Review the Talos Intelligence Vulnerability Report for additional remediation guidance.

Workarounds

• Implement strict Content Security Policy (CSP) headers that disallow inline script execution to reduce XSS impact
• Use web application firewalls to filter requests containing potential XSS payloads before they reach the application
• Restrict access to MedDream PACS Premium to internal networks only, reducing the attack surface for external threats
• Consider implementing HTTP-only and Secure flags on session cookies to prevent cookie theft via XSS

# Example Content Security Policy header configuration for Apache
# Add to your httpd.conf or .htaccess file
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';"

# Example for Nginx - add to your server block
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';";