Quick answers
- Is CVE-2026-40857 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-40857 being exploited in the wild.
- How severe is CVE-2026-40857?
- Informational severity, published 16 September 2026.
- Which products and versions are affected?
- WNC T-Mobile 5G Box IDU before 1.1.0.651412.
- Is there a fix for CVE-2026-40857?
- A patch was published on 2026-09-16: firmware version 1.1.0.651412 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-40857 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-40857?
- Check whether you run WNC T-Mobile 5G Box IDU at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is a cross-site request forgery (CSRF) vulnerability in the portal.cgi component of the router's web interface. The anti-CSRF protection mechanism accepts any arbitrary value for the csrf_token_value parameter without proper validation, failing to prevent forged requests from untrusted origins. Attack requires an authenticated user (administrator) to be currently logged into the router and to visit an attacker-controlled website. An attacker can perform any action the logged-in user has permission to perform, such as modifying device configuration, updating settings, or creating new accounts. The vulnerability has been patched in firmware version 1.1.0.651412 and later.
Affected products
- WNC T-Mobile 5G Box IDU before 1.1.0.651412
Timeline
- 2026-09-16: disclosed
- 2026-09-16: patched: firmware version 1.1.0.651412