CRITICAL 9.3 NVD

CVE-2026-40855

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,

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

References

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

Published: 2026-09-16 · Source: NVD · Feed updated: 2026-09-16

This critical severity vulnerability with a CVSS score of 9.3 was published on 2026-09-16 via NVD.

Risk Timeline

CVE Disclosed2026-09-16 · -1 days ago

Remediation Resources

Official Advisory

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

vulnfeed aggregates 14391 vulnerabilities from NVD, CISA KEV, Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.