CVE-2026-25200
📋 TL;DR
A vulnerability in MagicInfo9 Server allows authorized users to upload HTML files without proper authentication, leading to stored cross-site scripting (XSS). This can enable attackers to steal session cookies and perform account takeover attacks. The vulnerability affects MagicINFO 9 Server versions prior to 21.1090.1.
💻 Affected Systems
- Samsung MagicINFO 9 Server
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the MagicInfo9 Server instance, allowing attackers to steal administrator credentials, modify system configurations, deploy malware to connected displays, and pivot to internal networks.
Likely Case
Attackers upload malicious HTML files that execute JavaScript in victims' browsers, stealing session cookies and performing account takeover of authorized users, potentially gaining administrative access.
If Mitigated
With proper network segmentation and web application firewalls, the impact is limited to the MagicInfo9 Server application itself, though stored XSS could still affect users accessing the compromised interface.
🎯 Exploit Status
Exploitation requires authorized user credentials but the actual XSS payload delivery is straightforward once access is obtained. The CWE-434 (Unrestricted Upload of File with Dangerous Type) makes exploitation simple.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 21.1090.1 or later
Vendor Advisory: https://security.samsungtv.com/securityUpdates
Restart Required: Yes
Instructions:
1. Download MagicINFO 9 Server version 21.1090.1 or later from Samsung's official website. 2. Backup current configuration and data. 3. Run the installer to upgrade. 4. Restart the MagicInfo9 Server service. 5. Verify the version in the administration interface.
🔧 Temporary Workarounds
Restrict HTML file uploads via WAF
allConfigure web application firewall rules to block HTML file uploads to the MagicInfo9 Server interface
Implement strict file upload validation
allModify application configuration to validate file types and extensions before accepting uploads
🧯 If You Can't Patch
- Implement network segmentation to isolate MagicInfo9 Server from critical systems
- Deploy a web application firewall with specific rules to detect and block HTML file upload attempts
🔍 How to Verify
Check if Vulnerable:
Check the MagicInfo9 Server version in the administration interface. If version is less than 21.1090.1, the system is vulnerable.Check Version:
Check via MagicInfo9 Server web interface under System Information or SettingsVerify Fix Applied:
After patching, verify the version shows 21.1090.1 or higher in the administration interface and test that HTML file uploads are properly authenticated.📡 Detection & Monitoring
Log Indicators:
- HTML file uploads to MagicInfo9 Server without proper authentication logs
- Multiple failed authentication attempts followed by successful file uploads
- Unusual file upload patterns to the server
Network Indicators:
- HTTP POST requests with HTML file uploads to MagicInfo9 Server endpoints
- Unusual outbound connections from MagicInfo9 Server after file uploads
SIEM Query:
source="magicinfo9" AND (event="file_upload" AND file_extension="html") OR (event="authentication_failure" FOLLOWED BY event="file_upload" WITHIN 5m)