CVE-2026-40857
CSRF token bypass in T-Mobile 5G Box IDU routers
- State
- Published
- Severity
- 8.4 High
- Published
- Sep 16, 2026
- Updated
- Sep 16, 2026
- Reserved
- Apr 15, 2026
Description
WNC T-Mobile 5G Box IDU router contains a cross-site request forgery (CSRF) vulnerability in the portal.cgi component. The anti-CSRF mechanism fails to validate the csrf_token_value parameter, accepting any arbitrary value as valid. This allows a remote attacker to perform unauthorized actions on the device by tricking an authenticated user into visiting a malicious website.This issue has been fixed in firmware version 1.1.0.651412
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.4 High | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N | CERT-PL |
Weaknesses
- CWE-352 Cross-Site request forgery (CSRF)
Affected Products
| Product | Versions |
|---|---|
T-Mobile 5G Box IDUWNC |
|
References
- https://cert.pl/posts/2026/09/CVE-2026-40854third-party-advisory
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