CVE-2026-40855
Command Injection in T-Mobile 5G Box IDU router via ping functionality
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Reserved
- Apr 15, 2026
Description
WNC T-Mobile 5G Box IDU router is vulnerable to a command injection. The vulnerability exists in the ping functionality within the /cgi-bin/portal.cgi endpoint, specifically affecting the ping_ip, ping_size, and ping_times POST parameters. The root cause is the failure to verify and sanitize user-supplied input before incorporating it into a system command. This allows an authenticated attacker to execute arbitrary commands on the shell and gain root access to the system.This issue has been fixed in firmware version 1.1.0.651412
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | CERT-PL |
Weaknesses
- CWE-78 Improper neutralization of special elements used in an OS command ('OS command injection')
Affected Products
| Product | Versions |
|---|---|
T-Mobile 5G Box IDUWNC |
|
References
- https://cert.pl/posts/2026/09/CVE-2026-40854third-party-advisory
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