Vulnerability · Published Sep 16, 2026 · Assigned by CERT-PL

CVE-2026-58146Unauthorized remote code execution in T-Mobile 5G Box IDU routers

Critical 9.4

In plain English

A critical-severity OS command injection in T-Mobile 5G Box IDU from WNC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.9% (higher than 87% of all known vulnerabilities).

Severity (CVSS 4.0)9.4Critical

Exploit odds (30 days)2.9%top 13.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

WNC T-Mobile 5G Box IDU router is vulnerable to OS command injection vulnerability. The vulnerability exists within the /cgi-bin/portal.cgi endpoint, specifically through the cli_cookie POST parameter. The cli_cookie parameter value is directly concatenated into a find command string without proper sanitization. This allows a remote, unauthenticated attacker to inject and execute arbitrary shell commands as root on the underlying operating system. This issue has been fixed in firmware version 1.1.0.651412

Affected products (as reported)

Vendor	Product	Versions
WNC	T-Mobile 5G Box IDU	0 – before 1.1.0.651412

Weakness: CWE-78 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

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