CVE-2026-40856— Config disclosure in T-Mobile 5G Box IDU routers
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 improper access control. The vulnerability exists in the wnc_maccheck.cgi endpoint, which is accessible without authentication. It allows a remote attacker to retrieve sensitive configuration data, including the
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I. Basic Information for CVE-2026-40856
Vulnerability Information
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Vulnerability Title
Config disclosure in T-Mobile 5G Box IDU routers
Source: CVE Program / CVE List V5
Vulnerability Description
WNC T-Mobile 5G Box IDU router is vulnerable to improper access control. The vulnerability exists in the wnc_maccheck.cgi endpoint, which is accessible without authentication. It allows a remote attacker to retrieve sensitive configuration data, including the administrator web password, WiFi passphrase, and technical device information.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:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
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-2026-40856
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Security Blog Posts for CVE-2026-40856 (1)
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-2026-40855 | 9.3 CRITICAL | Command Injection in T-Mobile 5G Box IDU router via ping functionality |
| 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 |
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-2026-40855
Command Injection in T-Mobile 5G Box IDU router via ping fun -
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-2026-40855
Command Injection in T-Mobile 5G Box IDU router via ping fun -
CVE-2026-40854
Session auth bypass via cookie value in T-Mobile 5G Box IDU
V. Comments for CVE-2026-40856
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