CVE-2026-408548.7HighCWE-290
Session auth bypass via cookie value in T-Mobile 5G Box IDU routers
WNC · T-Mobile 5G Box IDU
Not in CISA KEVVendor fix available
0.3%probability of exploitation in the next 30 days
24th percentile
050100
Higher than 24% of scored CVEs
8.7HighCVSS 4.0
LowMediumHighCrit.
DescriptionNVD
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
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 17 Sep.
- Critical WNC flaws expose T-Mobile 5G Box routers to attacksSecurityOnline · first in our coverage · mentions it in passing
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