CVE-2026-28769 is a path traversal vulnerability classified under CWE-22, found in the International Datacasting Corporation (IDC) SFX Series SuperFlex Satellite Receiver Web management interface, specifically in the /IDC_Logging/checkifdone.cgi script. The vulnerability allows an authenticated attacker to manipulate the 'file' parameter to traverse directories beyond the intended restricted directory. This is due to insecure handling of file paths in the Perl script, which fails to properly sanitize or restrict user input, enabling directory traversal attacks. By exploiting this flaw, an attacker can enumerate arbitrary files on the underlying filesystem. The backup endpoint behavior provides feedback on file existence: a successful backup operation indicates the file exists, while a failure indicates it does not. This side-channel allows attackers to confirm the presence of sensitive files, potentially leading to information disclosure. The vulnerability does not require user interaction beyond authentication, and the CVSS 4.0 base score is 5.3 (medium severity), reflecting network attack vector, low complexity, no privileges required beyond authentication, and limited confidentiality impact. No patches or known exploits have been reported at the time of publication. The vulnerability affects the integrity of the system by allowing unauthorized file enumeration and potentially confidentiality if sensitive files are disclosed. The scope is limited to authenticated users with access to the web management interface.

The primary impact of CVE-2026-28769 is unauthorized information disclosure through file enumeration on the satellite receiver's underlying filesystem. Attackers with valid credentials can leverage this vulnerability to identify sensitive configuration files, logs, or credentials stored on the device, which could facilitate further attacks such as privilege escalation or lateral movement within the network. Given the device's role in satellite communications, exposure of sensitive files could compromise operational security, disrupt satellite broadcast services, or leak proprietary or classified information. The vulnerability does not directly allow remote code execution or denial of service but can be a stepping stone for more severe attacks. Organizations relying on IDC SFX Series receivers for critical communications, especially in defense, broadcasting, or emergency services, may face operational risks and data confidentiality breaches. The requirement for authentication limits exposure but insider threats or compromised credentials increase risk. The lack of user interaction requirement simplifies exploitation once authenticated access is obtained.

To mitigate CVE-2026-28769, organizations should first check for and apply any official patches or firmware updates from International Datacasting Corporation addressing this vulnerability. In the absence of patches, implement strict access controls to the web management interface, limiting access only to trusted administrators and using strong authentication mechanisms such as multi-factor authentication. Network segmentation should isolate the satellite receiver management interface from general user networks to reduce exposure. Employ web application firewalls (WAFs) or intrusion detection systems (IDS) with custom rules to detect and block suspicious directory traversal attempts targeting the 'file' parameter in /IDC_Logging/checkifdone.cgi. Regularly audit and monitor logs for unusual file access patterns or repeated backup operation requests that may indicate exploitation attempts. Additionally, review and harden the Perl scripts or configuration files if custom modifications are possible, ensuring proper input validation and sanitization of file path parameters. Conduct security awareness training for administrators to recognize and report suspicious activity. Finally, maintain an inventory of affected devices and prioritize remediation based on criticality and exposure.