CVE-2026-40855— Command Injection in T-Mobile 5G Box IDU router via ping functionality
Quick assessment
Affected
WNC T-Mobile 5G Box IDU
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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 th
Possible ATT&CK Techniques 1 AI
T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-40855
Vulnerability Information
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Vulnerability Title
Command Injection in T-Mobile 5G Box IDU router via ping functionality
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| WNC | T-Mobile 5G Box IDU | 0 ~ 1.1.0.651412 | - |
|
II. Public POCs for CVE-2026-40855
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Security Blog Posts for CVE-2026-40855 (1)
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🔗 Podatności w routerach WNC T-Mobile 5G Box IDU | CERT Polska third-party-advisory
Same Patch Batch · WNC · 2026-09-16 · 6 CVEs total
| CVE-2026-58146 | 9.4 CRITICAL | Unauthorized remote code execution in T-Mobile 5G Box IDU routers |
| CVE-2026-58147 | 9.3 CRITICAL | Authorized remote code execution via password change functionality in T-Mobile 5G Box IDU |
| CVE-2026-40854 | 8.7 HIGH | Session auth bypass via cookie value in T-Mobile 5G Box IDU routers |
| CVE-2026-40857 | 8.4 HIGH | CSRF token bypass in T-Mobile 5G Box IDU routers |
| CVE-2026-40856 | 7.1 HIGH | Config disclosure in T-Mobile 5G Box IDU routers |
IV. Related Vulnerabilities
Same product: T-Mobile 5G Box IDU
-
CVE-2026-58147
Authorized remote code execution via password change functio -
CVE-2026-58146
Unauthorized remote code execution in T-Mobile 5G Box IDU ro -
CVE-2026-40857
CSRF token bypass in T-Mobile 5G Box IDU routers -
CVE-2026-40856
Config disclosure in T-Mobile 5G Box IDU routers -
CVE-2026-40854
Session auth bypass via cookie value in T-Mobile 5G Box IDU
Same vendor: WNC
-
CVE-2026-58147
Authorized remote code execution via password change functio -
CVE-2026-58146
Unauthorized remote code execution in T-Mobile 5G Box IDU ro -
CVE-2026-40857
CSRF token bypass in T-Mobile 5G Box IDU routers -
CVE-2026-40856
Config disclosure in T-Mobile 5G Box IDU routers -
CVE-2026-40854
Session auth bypass via cookie value in T-Mobile 5G Box IDU
V. Comments for CVE-2026-40855
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