CVE-2026-40855

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

Assigner: CERT-PL
Reserved: 15.04.2026 Published: 16.09.2026 Updated: 16.09.2026

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

Metrics

CVSS Vector: 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Adjacent	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	WNC
Product	T-Mobile 5G Box IDU
Versions	Default: unaffected affected from 0 to 1.1.0.651412 (excl.)

Vendor

WNC

Product

T-Mobile 5G Box IDU

Versions

Default: unaffected

affected from 0 to 1.1.0.651412 (excl.)

Credits

Patryk Bogdan finder
Adam Borczyk finder

References

Problem Types

CWE-78 Improper neutralization of special elements used in an OS command ('OS command injection') CWE

Impacts

CAPEC-88 OS Command Injection