CVE-2026-40855

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

Published Sep 16, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.6% KEV · Not listed
Description
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

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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
Title Command Injection in T-Mobile 5G Box IDU router via ping functionality
First Time appeared Wnc
Wnc t-mobile 5g Box Idu
Weaknesses CWE-78
CPEs cpe:2.3:a:wnc:t-mobile_5g_box_idu:*:*:*:*:*:*:*:*
Vendors & Products Wnc
Wnc t-mobile 5g Box Idu
References
Metrics cvssV4_0

{'score': 9.3, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
CERT-PL
Published
Updated
Sep 16, 2026, 4:01 PM
Reserved
Apr 15, 2026, 11:10 AM
Status
Awaiting Analysis
Published
Sep 16, 2026, 12:17 PM
Modified
Sep 28, 2026, 11:10 PM