CVE-2026-40857 — CSRF token bypass in T-Mobile 5G Box IDU routers
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_v…
Published: 2026-09-16 · CVSS: 8.4 · CVSS 4.0
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7