CVE-2026-28771 is a reflected Cross-Site Scripting (XSS) vulnerability classified under CWE-79 affecting the International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver Web Management Interface, specifically version 101. The vulnerability exists in the /index.cgi endpoint where the 'cat' parameter accepts user input that is not properly neutralized before being reflected in the HTTP response. This improper input sanitization allows a remote attacker to inject malicious HTML or JavaScript code that executes within the context of the victim's browser session. Because the vulnerability is reflected, the attack vector typically involves tricking a user into clicking a specially crafted URL containing the malicious payload. The attacker can then perform actions such as session hijacking, defacement, or redirecting the user to malicious sites. The vulnerability does not require authentication and can be exploited over the network, but user interaction is necessary. The CVSS 4.0 score of 5.1 reflects medium severity, with network attack vector, low complexity, no privileges required, and user interaction needed. The impact on confidentiality and integrity is low, with no impact on availability. No patches or exploits are currently reported, but the vulnerability poses a risk to organizations relying on this satellite receiver's web management interface, especially if exposed to untrusted networks.

The primary impact of this vulnerability is the potential for attackers to execute arbitrary scripts in the context of users accessing the vulnerable web management interface. This can lead to session hijacking, unauthorized actions on behalf of the user, phishing, or redirection to malicious websites. For organizations, this could result in compromised administrative sessions, unauthorized configuration changes, or leakage of sensitive information accessible through the management interface. Although the vulnerability does not directly affect system availability or data integrity, successful exploitation could be a stepping stone for further attacks or lateral movement within the network. Given the specialized nature of the affected product—a satellite receiver management interface—the impact is particularly significant for organizations relying on IDC's SFX Series for critical broadcast or communication infrastructure. Exposure of this interface to untrusted networks increases the risk, potentially affecting operational continuity and trust in satellite data distribution services.

To mitigate this vulnerability, organizations should implement strict input validation and output encoding on the 'cat' parameter within the /index.cgi endpoint to ensure all user-supplied data is properly sanitized before reflection. If possible, apply vendor patches or updates once available. In the interim, restrict access to the web management interface by placing it behind a VPN or firewall rules limiting access to trusted IP addresses only. Employ web application firewalls (WAFs) that can detect and block reflected XSS payloads targeting this endpoint. Educate users and administrators about the risks of clicking unsolicited links related to the management interface. Regularly monitor logs for suspicious requests containing unusual or encoded input in the 'cat' parameter. Additionally, consider implementing Content Security Policy (CSP) headers to reduce the impact of potential XSS attacks by restricting script execution sources. Finally, conduct security assessments and penetration testing focused on web interfaces to identify and remediate similar vulnerabilities proactively.