Vulnerability 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
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-40854?
CVE-2026-40854 is a documented vulnerability. 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...
How severe is CVE-2026-40854?
CVSS scoring is not yet available for CVE-2026-40854. Check NVD for updates.
Is there a patch for CVE-2026-40854?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.