CVE-2026-40855Network attack vector

Root command execution via unsanitized ping parameters

Published Sep 16, 2026 · Updated Sep 16, 2026

OS command injection in the WNC T-Mobile 5G Box IDU before 1.1.0.651412 allows remote authenticated users to gain root access. The /cgi-bin/portal.cgi ping handler inserts the ping_ip, ping_size, and ping_times POST values into a system command without validation or sanitization. Access requires authentication to the router's web interface; injected shell commands execute with root privileges.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in the WNC T-Mobile 5G Box IDU before 1.1.0.651412 allows remote authenticated users to gain root access. The /cgi-bin/portal.cgi ping handler inserts the ping_ip, ping_size, and ping_times POST values into a system command without validation or sanitization. Access requires authentication to the router's web interface; injected shell commands execute with root privileges.

The record

CVE
CVE-2026-40855
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
WNC Corporation
Product
T-Mobile 5G Box IDU
Classifications
T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.1.0.651412

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WNC Corporation · T-Mobile 5G Box IDUversion=0 <1.1.0.651412

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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