HIGH 8.7 NVD

CVE-2026-40854

WNC T-Mobile 5G Box IDU router contains an authentication bypass vulnerability in the portal.cgi component. The session verification mechanism improperly valida

WNC T-Mobile 5G Box IDU router contains an authentication bypass vulnerability in the portal.cgi component. The session verification mechanism improperly validates the sessionid cookie by checking for the existence of a corresponding file in /tmp/login_user. An attacker can bypass authentication by using directory entries such as "." or ".." in the cookie, allowing unauthorized access to the administration panel.This issue has been fixed in firmware version 1.1.0.651412

References

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

Published: 2026-09-16 · Source: NVD · Feed updated: 2026-09-16

This high severity vulnerability with a CVSS score of 8.7 was published on 2026-09-16 via NVD.

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