CVE-2026-40856CWE-306

CVE-2026-40856

published September 16, 2026

CVSS
7.1
EPSS
0%
Percentile
30.0
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS
7.1 · NONE
CVSS v4.0
7.1 · 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
EPSS
0.00373 · 30.0th percentile
Weakness
CWE-306 · Missing Authentication for Critical Function
Published
2026-09-16T16:17Z
References (1)
https://cert.pl/posts/2026/09/CVE-2026-40854 · [email protected]
EPSS history
Timeline
  • 18 SEP 03:59Z
    EPSS moved — → 0%
    epss
  • 16 SEP 11:21Z
    Config disclosure in T-Mobile 5G Box IDU routers
    cvelistv5