CVE-2026-40856

UNKNOWN 0.0

Config disclosure in T-Mobile 5G Box IDU routers

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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

CWE	CWE-306
Vendor	wnc
Product	t-mobile 5g box idu
Published	Sep 16, 2026

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Affected Versions

WNC / T-Mobile 5G Box IDU

0 < 1.1.0.651412

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Patryk Bogdan Adam Borczyk