CVE-2025-58090: MedDream PACS Premium XSS Vulnerability

CVE-2025-58090 Overview

Multiple reflected cross-site scripting (XSS) vulnerabilities have been identified in the config.php functionality of MedDream PACS Premium 7.3.6.870. These vulnerabilities allow attackers to execute arbitrary JavaScript code in the context of a victim's browser session by crafting malicious URLs that exploit improper input sanitization. The vulnerability specifically affects the uploaddir parameter, which fails to properly validate or encode user-supplied input before reflecting it back in the HTTP response.

MedDream PACS is a widely-used Picture Archiving and Communication System in healthcare environments, making this vulnerability particularly concerning as it could be leveraged to target healthcare professionals and potentially access sensitive medical imaging data.

Critical Impact

Successful exploitation allows attackers to execute arbitrary JavaScript in authenticated user sessions, potentially leading to session hijacking, credential theft, or unauthorized access to sensitive medical imaging data stored in the PACS system.

Affected Products

• MedDream PACS Premium 7.3.6.870

Discovery Timeline

• 2026-01-20 - CVE CVE-2025-58090 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-58090

Vulnerability Analysis

This reflected XSS vulnerability exists due to improper neutralization of user input in the config.php endpoint of MedDream PACS Premium. When user-controlled data is passed through the uploaddir parameter, the application fails to implement adequate input validation or output encoding mechanisms. This allows malicious script content to be injected and reflected back to users, executing in their browser context.

The vulnerability requires user interaction, as victims must click on a specially crafted URL to trigger the exploit. However, given the healthcare context of the application and the potential for social engineering attacks targeting medical staff, this interaction requirement does not significantly diminish the risk.

Root Cause

The root cause is a classic CWE-79 (Improper Neutralization of Input During Web Page Generation) vulnerability. The config.php script directly incorporates the uploaddir parameter value into the HTML response without proper sanitization or encoding. This absence of defensive programming practices allows script injection through URL parameter manipulation.

Attack Vector

The attack is network-based and requires no authentication or special privileges. An attacker constructs a malicious URL containing JavaScript payload in the uploaddir parameter and distributes it to potential victims through phishing emails, malicious links, or watering hole attacks. When a victim clicks the link while authenticated to MedDream PACS Premium, the injected JavaScript executes with the victim's session privileges.

The reflected nature of this vulnerability means the malicious payload is not stored on the server but is instead reflected back to the user from the crafted request. This typically targets specific individuals rather than all users of the system.

Detection Methods for CVE-2025-58090

Indicators of Compromise

• Unusual HTTP GET requests to config.php containing script tags, event handlers, or encoded JavaScript payloads in the uploaddir parameter
• Web application logs showing URL-encoded characters such as %3Cscript%3E or JavaScript event handlers like onerror=, onload= in request parameters
• Client-side security tools detecting attempted XSS payloads in browser sessions
• Anomalous user session activity following link clicks in phishing emails referencing the PACS system

Detection Strategies

• Deploy Web Application Firewalls (WAF) with XSS signature detection configured to monitor the uploaddir parameter
• Implement Content Security Policy (CSP) headers with strict directives to prevent inline script execution
• Enable detailed logging on web servers to capture full request URIs and parameters for forensic analysis
• Utilize endpoint detection and response (EDR) solutions to identify suspicious browser behavior following link clicks

Monitoring Recommendations

• Monitor web server access logs for requests to config.php with unusually long or encoded uploaddir parameter values
• Set up alerts for HTTP requests containing common XSS payload patterns targeting the MedDream PACS application
• Review phishing reports and security awareness training metrics to identify potential social engineering campaigns targeting PACS users

How to Mitigate CVE-2025-58090

Immediate Actions Required

• Review the Talos Intelligence Vulnerability Report for the latest patch and remediation guidance
• Implement input validation and output encoding on the uploaddir parameter as a defense-in-depth measure
• Deploy WAF rules to block XSS payloads targeting the config.php endpoint
• Educate users about the risks of clicking unknown links, particularly those referencing internal PACS systems

Patch Information

Organizations should consult the official MedDream security advisories and the Talos Intelligence Vulnerability Report for specific patch availability and installation guidance. Contact MedDream support for the latest security update addressing this vulnerability.

Workarounds

• Implement strict Content Security Policy (CSP) headers that disallow inline script execution (script-src 'self')
• Configure WAF rules to sanitize or block the uploaddir parameter when it contains script-like content
• Restrict access to config.php to authorized administrative IP addresses or network segments only
• Consider placing the MedDream PACS system behind a VPN to reduce the attack surface for reflected XSS attacks

# Example Apache configuration to add 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>