CVE-2025-57786: MedDream PACS Premium XSS Vulnerability

CVE-2025-57786 Overview

A reflected cross-site scripting (XSS) vulnerability exists in the notifynewstudy functionality of MedDream PACS Premium 7.3.6.870. This vulnerability allows an attacker 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 malicious script executes within the trusted domain context, potentially compromising sensitive medical imaging data and user sessions.

Critical Impact

Healthcare organizations using MedDream PACS Premium are at risk of session hijacking, credential theft, and unauthorized access to medical imaging systems through social engineering attacks leveraging this XSS vulnerability.

Affected Products

• MedDream PACS Premium version 7.3.6.870
• MedDream PACS Premium prior versions potentially affected

Discovery Timeline

• 2026-01-20 - CVE-2025-57786 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-57786

Vulnerability Analysis

This reflected XSS vulnerability (CWE-79) affects the notifynewstudy functionality within MedDream PACS Premium, a Picture Archiving and Communication System used in healthcare environments for managing medical imaging data. The vulnerability occurs when user-supplied input is reflected back to the browser without proper sanitization or encoding.

In a reflected XSS attack, the malicious payload is embedded within a URL parameter and executed when the victim accesses the crafted link. The notifynewstudy endpoint fails to properly validate and encode user input before rendering it in the response, allowing attackers to inject arbitrary JavaScript code that executes in the security context of the MedDream application.

The attack requires user interaction—specifically, the victim must click on a malicious link. However, in healthcare environments where staff may receive numerous notifications about new studies, phishing attacks leveraging this vulnerability could be particularly effective.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the notifynewstudy functionality. When processing URL parameters, the application fails to sanitize special characters such as <, >, ", and ' that can be used to break out of HTML context and inject malicious script tags or event handlers. This lack of input validation allows attacker-controlled data to be interpreted as executable code rather than plain text.

Attack Vector

The attack is executed remotely over the network and requires user interaction. An attacker crafts a malicious URL containing JavaScript payload in a vulnerable parameter and delivers it to the victim through phishing emails, instant messages, or malicious websites. When the victim clicks the link and authenticates to the MedDream PACS system, the injected script executes with the victim's session privileges.

The vulnerability has a changed scope, meaning successful exploitation can affect resources beyond the vulnerable component—the malicious script can access cookies, session tokens, and other sensitive information within the browser's same-origin context, potentially compromising the entire MedDream session and any integrated healthcare systems.

The vulnerability mechanism involves insufficient output encoding in the notifynewstudy endpoint. When the application processes requests to this functionality, user-supplied input is directly reflected in the HTTP response without proper HTML entity encoding or JavaScript escaping. For detailed technical analysis, refer to the Talos Intelligence Vulnerability Report.

Detection Methods for CVE-2025-57786

Indicators of Compromise

• Unusual HTTP requests to the notifynewstudy endpoint containing JavaScript code or HTML tags in URL parameters
• Web server logs showing URL-encoded script tags (%3Cscript%3E) or event handlers (onerror, onload) in request URIs
• Browser console errors or unexpected script execution originating from MedDream PACS domains
• User reports of suspicious pop-ups or unexpected behavior after clicking MedDream-related links

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing XSS payloads in URL parameters
• Configure intrusion detection systems (IDS) to alert on HTTP requests with common XSS patterns targeting the notifynewstudy endpoint
• Monitor web server access logs for requests containing encoded special characters or script injection attempts
• Enable browser Content Security Policy (CSP) violation reporting to detect XSS exploitation attempts

Monitoring Recommendations

• Enable detailed logging for all requests to the MedDream PACS application, particularly the notifynewstudy functionality
• Configure SIEM correlation rules to identify patterns of XSS probing attempts across multiple user sessions
• Implement real-time alerting for any blocked XSS attempts by WAF or security controls
• Monitor for phishing campaigns targeting healthcare staff with MedDream-related lures

How to Mitigate CVE-2025-57786

Immediate Actions Required

• Review and restrict access to the MedDream PACS notifynewstudy functionality until a patch is applied
• Deploy Web Application Firewall rules to filter malicious input targeting vulnerable endpoints
• Educate users about the risks of clicking links in unsolicited emails or messages, especially those referencing new medical studies
• Implement Content Security Policy headers to restrict inline script execution and mitigate XSS impact

Patch Information

Organizations should consult the vendor advisory and the Talos Intelligence Vulnerability Report for official patch availability and upgrade guidance. Contact MedDream support to obtain the latest security updates for PACS Premium that address this reflected XSS vulnerability.

Workarounds

• Implement strict Content Security Policy (CSP) headers with script-src 'self' directive to prevent execution of inline scripts
• Deploy a reverse proxy or WAF configured to sanitize or block requests containing script tags and event handlers
• Restrict network access to the MedDream PACS application to trusted internal networks or VPN connections only
• Consider disabling or restricting access to the notifynewstudy functionality if not critical to operations

# Example Apache configuration to add Content Security Policy header
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; frame-ancestors 'self';"
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
</IfModule>