CVE-2025-58091: MedDream PACS Premium XSS Vulnerability

CVE-2025-58091 Overview

Multiple reflected cross-site scripting (XSS) vulnerabilities exist in the config.php functionality of MedDream PACS Premium 7.3.6.870. Specially crafted malicious URLs can lead to arbitrary JavaScript code execution in the context of a victim's browser session. An attacker can provide a crafted URL to trigger these vulnerabilities, specifically affecting the thumbnaildir parameter.

Critical Impact

Attackers can execute arbitrary JavaScript code in victims' browsers, potentially stealing session tokens, credentials, or performing actions on behalf of authenticated users within the medical imaging system.

Affected Products

• MedDream PACS Premium 7.3.6.870
• MedDream PACS Premium (earlier versions potentially affected)

Discovery Timeline

• 2026-01-20 - CVE-2025-58091 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-58091

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as reflected cross-site scripting. The flaw exists in the config.php endpoint of MedDream PACS Premium, a medical imaging Picture Archiving and Communication System (PACS) used in healthcare environments.

The vulnerability allows attackers to inject malicious JavaScript code through the thumbnaildir parameter. When a victim clicks on a specially crafted URL containing the malicious payload, the script executes within their browser session with the same privileges as the authenticated user.

In healthcare environments, this is particularly concerning as PACS systems often contain sensitive patient data and are accessed by medical professionals with elevated privileges. Successful exploitation could lead to session hijacking, credential theft, or unauthorized access to protected health information (PHI).

Root Cause

The root cause is improper input validation and output encoding in the config.php file. The thumbnaildir parameter value is reflected back to the user's browser without adequate sanitization, allowing an attacker to inject executable JavaScript code. This occurs because user-supplied input is not properly escaped before being included in the HTML response.

Attack Vector

The attack requires user interaction - specifically, the victim must click on a malicious link crafted by the attacker. The attack is network-based and does not require authentication to exploit, though the impact depends on the victim's authentication state. A typical attack scenario involves:

1. Attacker crafts a malicious URL containing JavaScript payload in the thumbnaildir parameter
2. Attacker delivers the URL to victims via phishing email, social engineering, or embedding in another website
3. When the victim clicks the link while authenticated to MedDream PACS, the malicious script executes
4. The script can steal session cookies, capture credentials, or perform actions as the authenticated user

For detailed technical information, refer to the Talos Intelligence Vulnerability Report.

Detection Methods for CVE-2025-58091

Indicators of Compromise

• Suspicious HTTP requests to config.php containing JavaScript code or HTML entities in the thumbnaildir parameter
• Web server logs showing URL-encoded script tags or event handlers in query strings
• Unusual patterns of config.php access from external referrers
• Session tokens appearing in outbound HTTP requests to unknown domains

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block XSS payloads in URL parameters
• Monitor web server access logs for requests containing suspicious patterns such as <script>, javascript:, onerror=, or onload= in query parameters
• Implement Content Security Policy (CSP) headers and monitor for policy violations
• Configure intrusion detection systems (IDS) to alert on known XSS attack patterns targeting the config.php endpoint

Monitoring Recommendations

• Enable detailed access logging for the MedDream PACS web application
• Set up alerts for abnormal patterns of requests to config.php with unusual parameter values
• Monitor for CSP violation reports if implemented
• Review authentication logs for suspicious session activity following access to config.php

How to Mitigate CVE-2025-58091

Immediate Actions Required

• Apply vendor patches as soon as they become available from MedDream
• Implement web application firewall (WAF) rules to filter XSS payloads in the thumbnaildir parameter
• Deploy Content Security Policy (CSP) headers to prevent inline script execution
• Restrict access to the MedDream PACS interface to trusted networks and authenticated users only
• Educate users about the risks of clicking on suspicious links

Patch Information

Check the Talos Intelligence Vulnerability Report for the latest patch information and remediation guidance from the vendor. Organizations should contact MedDream directly for security updates addressing this vulnerability in PACS Premium version 7.3.6.870.

Workarounds

• Implement strict Content Security Policy (CSP) headers that disable inline script execution
• Deploy a reverse proxy or WAF with XSS filtering capabilities in front of the MedDream PACS application
• Restrict network access to the PACS system using firewall rules to limit exposure
• Consider temporarily disabling or restricting access to config.php if not required for normal operations
• Enable HttpOnly and Secure flags on all session cookies to reduce the impact of potential session theft

# Example Apache configuration for CSP headers
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>