Executive brief
The WNC T-Mobile 5G Box IDU is a 5G indoor router used by T-Mobile customers to provide network connectivity. A remote attacker can inject and execute arbitrary shell commands with root privileges through an unauthenticated endpoint, potentially leading to complete device compromise, network access theft, and customer data exposure.
Technical details
This is an OS command injection vulnerability (CWE-78) in the /cgi-bin/portal.cgi endpoint, specifically within the cli_cookie POST parameter. The vulnerable code directly concatenates the cli_cookie parameter value into a find command string without sanitization or validation. No authentication is required—an attacker can reach this endpoint over the network and inject shell metacharacters to execute arbitrary commands with root privileges. The vulnerability allows complete system compromise including reading/modifying configuration, extracting credentials, and installing malware. The fix is available in firmware version 1.1.0.651412 and later.
Affected products
- WNC T-Mobile 5G Box IDU before 1.1.0.651412
Timeline
- 2026-09-16: disclosed
- 2026-09-16: patched: Fixed in firmware version 1.1.0.651412