CVE-2025-54495: MedDream PACS Premium XSS Vulnerability

CVE-2025-54495 Overview

A reflected cross-site scripting (XSS) vulnerability exists in the emailfailedjob 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 malicious script executes with the same privileges as the authenticated user, potentially leading to session hijacking, credential theft, or unauthorized actions within the medical imaging system.

Critical Impact

Attackers can execute arbitrary JavaScript in the context of authenticated healthcare personnel, potentially compromising sensitive patient data and medical imaging workflows in PACS environments.

Affected Products

• MedDream PACS Premium 7.3.6.870
• MedDream PACS Premium versions prior to patched release

Discovery Timeline

• 2026-01-20 - CVE-2025-54495 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-54495

Vulnerability Analysis

This reflected XSS vulnerability (CWE-79) occurs within the emailfailedjob functionality of MedDream PACS Premium. The application fails to properly sanitize user-supplied input before reflecting it back in the HTTP response. When an attacker crafts a URL containing malicious JavaScript payload and convinces a victim to click on it, the script executes within the victim's browser session.

The vulnerability requires user interaction to exploit—specifically, the victim must navigate to the attacker-controlled URL. However, once triggered, the malicious script runs with full access to the user's session context, enabling attacks such as cookie theft, session hijacking, or manipulation of the PACS interface to access or modify medical imaging data.

Root Cause

The root cause of this vulnerability is improper input validation and output encoding in the emailfailedjob endpoint. User-controlled input is reflected directly into the HTML response without adequate sanitization, allowing attackers to inject arbitrary HTML and JavaScript content. This is a classic reflected XSS pattern where the application trusts user input and fails to apply proper context-aware output encoding.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker constructs a malicious URL targeting the vulnerable emailfailedjob endpoint with a JavaScript payload embedded in a parameter. The attacker then distributes this URL through phishing emails, social engineering, or by embedding it in external websites. When a victim with an active session clicks the link, the injected script executes in their browser context.

The malicious payload could perform various actions including stealing session cookies, capturing user credentials, performing unauthorized actions on behalf of the user, or redirecting the user to malicious sites. In a healthcare environment like PACS, this could lead to unauthorized access to sensitive patient imaging data.

Detection Methods for CVE-2025-54495

Indicators of Compromise

• Unusual HTTP requests to the emailfailedjob endpoint containing JavaScript code patterns such as <script>, javascript:, or encoded variants
• Web server logs showing URL parameters with suspicious encoding or script tags targeting MedDream PACS endpoints
• User reports of unexpected browser behavior or redirects when accessing PACS functionality
• Session anomalies indicating potential cookie theft or session hijacking attempts

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing XSS payload patterns targeting the emailfailedjob endpoint
• Enable detailed logging on the MedDream PACS web server and monitor for requests with suspicious URL parameters
• Deploy browser-based security controls such as Content Security Policy (CSP) headers to detect and prevent inline script execution
• Utilize endpoint detection and response (EDR) solutions to identify suspicious browser activity following access to PACS URLs

Monitoring Recommendations

• Configure SIEM alerts for HTTP requests to MedDream PACS containing common XSS patterns or unusual character encodings
• Monitor authentication logs for session anomalies that may indicate successful exploitation and session hijacking
• Establish baseline behavior for the emailfailedjob functionality and alert on deviations
• Review network traffic for data exfiltration attempts following user access to suspicious URLs

How to Mitigate CVE-2025-54495

Immediate Actions Required

• Review network access controls and restrict external access to the MedDream PACS application where possible
• Educate users about phishing risks and the importance of not clicking suspicious links, especially those containing the PACS URL
• Implement or strengthen Content Security Policy (CSP) headers to mitigate the impact of XSS attacks
• Consider deploying a web application firewall (WAF) with XSS filtering rules in front of the MedDream PACS server

Patch Information

Organizations should consult the Talos Intelligence Vulnerability Report for the latest patch information and vendor guidance. Contact MedDream directly for specific patch availability and upgrade instructions for PACS Premium installations.

Workarounds

• Restrict access to the MedDream PACS application to trusted internal networks only, reducing exposure to external attackers
• Implement strict Content Security Policy headers that disable inline script execution and restrict script sources
• Deploy a reverse proxy or WAF in front of the application to filter malicious requests before they reach the server
• Enable HTTP-only and Secure flags on session cookies to reduce the impact of potential cookie theft through XSS

# Example Content Security Policy header configuration for Apache
# Add to httpd.conf or .htaccess for MedDream PACS
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self'"
Header set X-XSS-Protection "1; mode=block"
Header set X-Content-Type-Options "nosniff"