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 versionĀ 1.1.0.651412
Metrics
Affected Vendors & Products
References
| Link | Providers |
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| https://cert.pl/posts/2026/09/CVE-2026-40854 |
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History
Wed, 16 Sep 2026 18:30:00 +0000
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ssvc
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Wed, 16 Sep 2026 11:45:00 +0000
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| 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 versionĀ 1.1.0.651412 | |
| Title | Session auth bypass via cookie value in T-Mobile 5G Box IDU routers | |
| First Time appeared |
Wnc
Wnc t-mobile 5g Box Idu |
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| Weaknesses | CWE-290 | |
| CPEs | cpe:2.3:a:wnc:t-mobile_5g_box_idu:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Wnc
Wnc t-mobile 5g Box Idu |
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| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: CERT-PL
Published: 2026-09-16T11:21:10.202Z
Updated: 2026-09-16T17:41:03.847Z
Reserved: 2026-04-15T11:10:34.849Z
Link: CVE-2026-40854
Updated: 2026-09-16T17:40:55.117Z
Status : Awaiting Analysis
Published: 2026-09-16T12:17:03.540
Modified: 2026-09-28T23:10:00.143
Link: CVE-2026-40854
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