CVE-2026-40855 — Command Injection in T-Mobile 5G Box IDU router via ping functionality

CVE-2026-40855

Command Injection in T-Mobile 5G Box IDU router via ping functionality PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
WNC / T-Mobile 5G Box IDU	affected 0 before 1.1.0.651412

CWE

CWE-78

References

https://cert.pl/posts/2026/09/CVE-2026-40854

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.