CVE-2026-40854

— UNSCORED

Published 2026-09-16 · Updated 2026-09-16

AI analysis for this CVE has not been generated yet. Raw NVD data is shown below.

NVD description

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

Weaknesses

CWE-290

References

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

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.