CVE-2026-28772: IDC SFX SatelliteReceiver XSS Vulnerability

CVE-2026-28772 Overview

A Reflected Cross-Site Scripting (XSS) vulnerability has been identified in the International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver Web Management Interface. The vulnerability exists in the /IDC_Logging/index.cgi endpoint of version 101, allowing remote attackers to execute arbitrary web scripts or HTML code. The attack is triggered by sending a crafted payload through the submitType parameter, which is reflected directly into the DOM without proper input sanitization or escaping.

Critical Impact

Remote attackers can execute malicious scripts in victim browsers, potentially leading to session hijacking, credential theft, or unauthorized actions within the satellite receiver's web management interface.

Affected Products

• International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver Web Management Interface version 101
• IDC SFX2100 Satellite Receiver systems running vulnerable firmware

Discovery Timeline

• 2026-03-04 - CVE CVE-2026-28772 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28772

Vulnerability Analysis

This Reflected Cross-Site Scripting vulnerability (CWE-79) allows attackers to inject malicious client-side scripts into web pages viewed by other users. The vulnerability occurs because the web management interface fails to properly sanitize user-supplied input in the submitType parameter before reflecting it back to the user's browser. When a victim clicks a malicious link containing the crafted payload, the script executes within the context of the authenticated user's session, potentially compromising the satellite receiver management functions.

The attack requires user interaction, as victims must be tricked into clicking a malicious link. However, once executed, the attacker can perform actions on behalf of the authenticated administrator, steal session cookies, redirect users to phishing pages, or modify displayed content within the management interface.

Root Cause

The root cause of this vulnerability is improper input validation and insufficient output encoding in the /IDC_Logging/index.cgi endpoint. The submitType parameter accepts arbitrary input that is directly reflected into the Document Object Model (DOM) without proper HTML entity encoding or JavaScript escaping. This allows specially crafted input containing script tags or JavaScript event handlers to execute in the victim's browser context.

Attack Vector

The attack vector is network-based, requiring no authentication to exploit. An attacker crafts a malicious URL containing JavaScript code in the submitType parameter and distributes it to potential victims through phishing emails, malicious websites, or social engineering tactics. When an authenticated administrator of the satellite receiver management interface clicks the link, the injected script executes with the privileges of that user.

The vulnerability is exploited by injecting malicious JavaScript into the submitType parameter of the /IDC_Logging/index.cgi endpoint. When a victim navigates to the crafted URL, the unescaped input is rendered directly in the page response, causing the browser to execute the attacker's payload. This can be used to steal session tokens, perform unauthorized configuration changes, or redirect administrators to credential harvesting pages. Detailed technical analysis is available in the Abdulmhs Blog Vulnerability Analysis.

Detection Methods for CVE-2026-28772

Indicators of Compromise

• HTTP requests to /IDC_Logging/index.cgi containing <script> tags or JavaScript event handlers in the submitType parameter
• Unusual URL patterns with encoded JavaScript payloads targeting the IDC web management interface
• Web server logs showing requests with suspicious characters such as <, >, ", ', or javascript: in query parameters
• Unexpected outbound connections from administrator workstations after accessing the satellite receiver management interface

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block requests containing script injection patterns in URL parameters
• Configure intrusion detection systems (IDS) to alert on HTTP requests containing XSS attack signatures targeting /IDC_Logging/index.cgi
• Monitor web server access logs for anomalous requests to the logging endpoint with encoded payloads
• Deploy browser-based security extensions that detect and block reflected XSS attempts

Monitoring Recommendations

• Enable detailed logging on the IDC SFX Series web management interface to capture all incoming requests
• Implement Content Security Policy (CSP) headers to restrict script execution sources and detect policy violations
• Monitor network traffic for suspicious requests to satellite receiver management interfaces
• Review administrator access patterns for unusual login times or IP addresses following link clicks

How to Mitigate CVE-2026-28772

Immediate Actions Required

• Restrict access to the IDC SFX Series web management interface to trusted networks and IP addresses only
• Implement network segmentation to isolate satellite receiver management systems from general user networks
• Train administrators to recognize and avoid clicking suspicious links, especially those targeting equipment management interfaces
• Deploy a web application firewall (WAF) in front of the management interface to filter malicious requests

Patch Information

No official patch information is currently available from International Datacasting Corporation. Organizations should monitor vendor communications and apply security updates as soon as they become available. In the interim, implement the recommended workarounds to reduce exposure risk. For additional technical details, refer to the Abdulmhs Blog Vulnerability Analysis.

Workarounds

• Restrict access to the web management interface using IP-based access control lists (ACLs), allowing only authorized administrator workstations
• Place the satellite receiver management interface behind a VPN, requiring authentication before accessing the vulnerable endpoint
• Disable the web management interface entirely if it is not required for operational purposes
• Implement a reverse proxy with input validation and output encoding to sanitize requests before they reach the vulnerable application

Access control should be configured at the network level to minimize exposure. Example firewall rules should restrict access to the management interface (/IDC_Logging/index.cgi and related endpoints) to specific trusted IP addresses. Additionally, administrators should avoid clicking links to management interfaces from email or untrusted sources and instead navigate directly to the interface using bookmarked URLs.