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  4. CVE 2026 40857 csrf token bypass in t mobile 5g box idu routers
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Back to active CVEs
High · CVSS 8.4CVE-2026-40857

CSRF token bypass in T-Mobile 5G Box IDU routersCVE-2026-40857

Answer in brief

CVE-2026-40857 records a High severity (CVSS 8.4) vulnerability in CSRF token bypass in T-Mobile 5G Box IDU routers. The current sources do not mark it as known exploited. The current feed maps WNC/T-Mobile 5G Box IDU (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 28, 2026Source checked Oct 31, 2026First seen by HOL Sep 16, 2026Material review Sep 28, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.4
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 8.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps WNC/T-Mobile 5G Box IDU (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
WNC/T-Mobile 5G Box IDUgeneric>=0 <1.1.0.6514121.1.0.651412

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for WNC/T-Mobile 5G Box IDU.
  2. 2Review the reported fix. Update WNC/T-Mobile 5G Box IDU to 1.1.0.651412 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 16, 2026

Sources and claim methodology

  • Source referencecert.pl
Upstream source 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

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
CSRF
EPSS
Not reported
CWE IDs
CWE-352
Source
CVE List V5
Source checked
Oct 31, 2026
References
1 linked source
Open source record