CVE-2026-40857: CWE-352 Cross-Site request forgery (CSRF) in WNC T-Mobile 5G Box IDU
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
AI Analysis
Technical Summary
CVE-2026-40857 is a CSRF vulnerability in the WNC T-Mobile 5G Box IDU router's portal.cgi component. The anti-CSRF mechanism fails to properly validate the csrf_token_value parameter, allowing any arbitrary value to be accepted as valid. This enables remote attackers to execute unauthorized actions on the device by leveraging an authenticated user's session through social engineering. The issue has been resolved in firmware version 1.1.0.651412.
Potential Impact
An attacker can exploit this vulnerability to perform unauthorized actions on the affected router by tricking an authenticated user into visiting a malicious website. This could lead to unauthorized configuration changes or other malicious activities on the device. The CVSS 4.0 score is 8.4 (high severity), reflecting the significant risk posed by this vulnerability when exploited.
Mitigation Recommendations
Upgrade the WNC T-Mobile 5G Box IDU router firmware to version 1.1.0.651412 or later, where this CSRF vulnerability has been fixed. Applying this official firmware update fully mitigates the issue.
CVE-2026-40857: CWE-352 Cross-Site request forgery (CSRF) in WNC T-Mobile 5G Box IDU
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
CVSS v4.0
Score 8.4high
Affected software
WNC
T-Mobile 5G Box IDU
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-40857 is a CSRF vulnerability in the WNC T-Mobile 5G Box IDU router's portal.cgi component. The anti-CSRF mechanism fails to properly validate the csrf_token_value parameter, allowing any arbitrary value to be accepted as valid. This enables remote attackers to execute unauthorized actions on the device by leveraging an authenticated user's session through social engineering. The issue has been resolved in firmware version 1.1.0.651412.
Potential Impact
An attacker can exploit this vulnerability to perform unauthorized actions on the affected router by tricking an authenticated user into visiting a malicious website. This could lead to unauthorized configuration changes or other malicious activities on the device. The CVSS 4.0 score is 8.4 (high severity), reflecting the significant risk posed by this vulnerability when exploited.
Mitigation Recommendations
Upgrade the WNC T-Mobile 5G Box IDU router firmware to version 1.1.0.651412 or later, where this CSRF vulnerability has been fixed. Applying this official firmware update fully mitigates the issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- CERT-PL
- Date Reserved
- 2026-04-15T11:10:34.850Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aaa7e3555bf5e2cf5884ace
Added to database: 09/16/2026, 11:32:05 UTC
Last enriched: 09/16/2026, 11:47:13 UTC
Last updated: 09/17/2026, 01:03:58 UTC
Views: 9
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.