{"id":"CVE-2026-40855","title":"WNC T-Mobile 5G Box IDU router is vulnerable to a command injection","summary":"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 parameter…","severity":"critical","cvss":9.3,"cvssVector":"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","cwe":["CWE-78"],"vendor":"WNC","product":"T-Mobile 5G Box IDU","affected":["t-mobile_5g_box_idu < 1.1.0.651412"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:14:25.980","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40855","references":[{"url":"https://cert.pl/posts/2026/09/CVE-2026-40854","label":"cvd@cert.pl"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-16T16:01:43.879737Z"},"cvssSource":"cna","ingestedAt":"2026-09-16T11:54:38.961Z","epss":0.01133,"epssPercentile":0.64554,"slug":"CVE-2026-40855","body":"## Overview\n\nWNC 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\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":51,"depthScoreParts":{"impact":51.2,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}