CVE-2026-40856 — Config disclosure in T-Mobile 5G Box IDU routers

CVE-2026-40856

Config disclosure in T-Mobile 5G Box IDU routers PUBLISHED

Description (CNA)

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

Affected (CNA)

Vendor / product	Versions
WNC / T-Mobile 5G Box IDU	affected 0 before 1.1.0.651412

CWE

CWE-306

References

https://cert.pl/posts/2026/09/CVE-2026-40854

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.