CVE-2026-28771 identifies a reflected Cross-Site Scripting (XSS) vulnerability classified under CWE-79 in the web management interface of the International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver, specifically version 101. The vulnerability resides in the /index.cgi endpoint where the 'cat' parameter accepts user input that is inadequately sanitized before being reflected in the HTTP response. This improper neutralization of input allows remote attackers to inject malicious HTML or JavaScript code that executes in the context of the victim's browser session. The attack vector is network-based (AV:N), requires no privileges (PR:N), and no authentication (AT:N), but does require user interaction (UI:A), such as clicking a malicious link. The impact on confidentiality and integrity is low, as the vulnerability does not directly allow data modification or access escalation, but it can lead to session hijacking or phishing attacks. Availability is not affected. The vulnerability has a CVSS 4.0 score of 5.1, reflecting medium severity. No patches or known exploits are currently available or reported. The vulnerability could be exploited by attackers to steal session cookies, perform actions on behalf of authenticated users, or deliver further malware payloads through the victim's browser. Given the specialized nature of the product—satellite receivers used in broadcast and data distribution—the attack surface is limited but critical for organizations relying on this technology for operational continuity.

The primary impact of CVE-2026-28771 is the potential for attackers to execute arbitrary scripts in the context of the victim's browser, leading to session hijacking, credential theft, or unauthorized actions within the satellite receiver's management interface. This can compromise the integrity of device management and potentially disrupt broadcast or data distribution services. While the vulnerability does not directly allow remote code execution on the device or network intrusion, the ability to manipulate the web interface could facilitate further attacks or unauthorized configuration changes. Organizations operating IDC SFX Series SuperFlex Satellite Receivers in critical infrastructure sectors such as broadcasting, emergency services, or government communications could face operational disruptions or data leakage. The requirement for user interaction limits mass exploitation but targeted spear-phishing or social engineering attacks remain a significant risk. The absence of known exploits reduces immediate threat but does not eliminate the risk of future exploitation. Overall, the vulnerability poses a medium risk to confidentiality and integrity, with limited impact on availability.

To mitigate CVE-2026-28771, organizations should implement multiple layers of defense: 1) Apply input validation and sanitization on the 'cat' parameter to ensure that any user-supplied data is properly neutralized before being reflected in the HTTP response. 2) Implement output encoding (e.g., HTML entity encoding) to prevent execution of injected scripts. 3) Restrict access to the web management interface using network segmentation, VPNs, or IP whitelisting to limit exposure to trusted users only. 4) Employ Content Security Policy (CSP) headers to reduce the impact of potential XSS by restricting script sources. 5) Educate users and administrators about the risks of clicking untrusted links and implement email filtering to reduce phishing attempts. 6) Monitor web server logs for suspicious requests targeting the 'cat' parameter. 7) Engage with IDC for official patches or firmware updates addressing this vulnerability and apply them promptly once available. 8) Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block XSS payloads targeting this endpoint. These measures combined will reduce the likelihood and impact of exploitation.