CVE-2026-40855: critical vulnerability in WNC T-Mobile 5G Box IDU
Command Injection in T-Mobile 5G Box IDU router via ping functionality
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.3epss 1.6%
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
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
Affected products
WNC · T-Mobile 5G Box IDURelated CVEs — WNC T-Mobile 5G Box IDU
In the same product, most dangerous first.
CVE-2026-58146CRITICALUnauthorized remote code execution in T-Mobile 5G Box IDU routersEPSS 2.9%CVE-2026-58147CRITICALAuthorized remote code execution via password change functionality in T-Mobile 5G Box IDU routersEPSS 1.6%CVE-2026-40856HIGHConfig disclosure in T-Mobile 5G Box IDU routersEPSS 0.4%CVE-2026-40854HIGHSession auth bypass via cookie value in T-Mobile 5G Box IDU routersEPSS 0.3%CVE-2026-40857HIGHCSRF token bypass in T-Mobile 5G Box IDU routersEPSS 0.2%