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CVE-2026-40857— CSRF token bypass in T-Mobile 5G Box IDU routers

Quick assessment

Affected
WNC T-Mobile 5G Box IDU
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 attack

CVSS 8.4 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40857

Vulnerability Information
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Vulnerability Title
CSRF token bypass in T-Mobile 5G Box IDU routers
Source: CVE Program / CVE List V5
Vulnerability 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
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
WNC T-Mobile 5G Box IDU 0 ~ 1.1.0.651412 -

II. Public POCs for CVE-2026-40857

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III. Intelligence Information for CVE-2026-40857

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Security Blog Posts for CVE-2026-40857 (1)

Same Patch Batch · WNC · 2026-09-16 · 6 CVEs total

CVE-2026-58146 9.4 CRITICAL Unauthorized remote code execution in T-Mobile 5G Box IDU routers
CVE-2026-58147 9.3 CRITICAL Authorized remote code execution via password change functionality in T-Mobile 5G Box IDU
CVE-2026-40855 9.3 CRITICAL Command Injection in T-Mobile 5G Box IDU router via ping functionality
CVE-2026-40854 8.7 HIGH Session auth bypass via cookie value in T-Mobile 5G Box IDU routers
CVE-2026-40856 7.1 HIGH Config disclosure in T-Mobile 5G Box IDU routers

IV. Related Vulnerabilities

Same product: T-Mobile 5G Box IDU
Same vendor: WNC
Same weakness: CWE-352

V. Comments for CVE-2026-40857

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