CVE-2026-40856

Config disclosure in T-Mobile 5G Box IDU routers

HIGH

7.1

CVSS Score

Published: September 16, 2026 at 11:21 AM UTC

Updated: September 28, 2026 at 11:10 PM UTC

1 product affected across 1 vendorT-Mobile 5G Box IDU

Using T-Mobile 5G Box IDU by WNC?

Get instant alerts when new vulnerabilities affect T-Mobile 5G Box IDU - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

HIGH7.1

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

T-Mobile 5G Box IDU · Wnc

60%

v < 1.1.0.651412

Affected range stops below 1.1.0.651412, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Third Party Advisory

Source: cverecord

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHCERT-PL

Vector?

Quick Info

StatusAWAITING ANALYSIS

CWE

CWE-306

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card