CVE-2026-40856: high-severity vulnerability in WNC T-Mobile 5G Box IDU
Config disclosure in T-Mobile 5G Box IDU routers
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.4%
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
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
Affected products
WNC · T-Mobile 5G Box IDURelated CVEs — WNC T-Mobile 5G Box IDU
In the same product, most dangerous first.
CVE-2026-58146CRITICALUnauthorized remote code execution in T-Mobile 5G Box IDU routersEPSS 2.9%CVE-2026-40855CRITICALCommand Injection in T-Mobile 5G Box IDU router via ping functionalityEPSS 1.6%CVE-2026-58147CRITICALAuthorized remote code execution via password change functionality in T-Mobile 5G Box IDU routersEPSS 1.6%CVE-2026-40854HIGHSession auth bypass via cookie value in T-Mobile 5G Box IDU routersEPSS 0.3%CVE-2026-40857HIGHCSRF token bypass in T-Mobile 5G Box IDU routersEPSS 0.2%