CVE-2026-40855 (GCVE-0-2026-40855)
Vulnerability from cvelistv5 – Published: 2026-09-16 11:21 – Updated: 2026-09-16 11:21
VLAI
EPSS
VEX
Title
Command Injection in T-Mobile 5G Box IDU router via ping functionality
Summary
WNC T-Mobile 5G Box IDU router is vulnerable to a command injection. The vulnerability exists in the ping functionality within the /cgi-bin/portal.cgi endpoint, specifically affecting the ping_ip, ping_size, and ping_times POST parameters. The root cause is the failure to verify and sanitize user-supplied input before incorporating it into a system command. This allows an authenticated attacker to execute arbitrary commands on the shell and gain root access to the system.This issue has been fixed in firmware version 1.1.0.651412
Severity
CWE
- CWE-78 - Improper neutralization of special elements used in an OS command ('OS command injection')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://cert.pl/posts/2026/09/CVE-2026-40854 | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| WNC | T-Mobile 5G Box IDU |
Affected:
0 , < 1.1.0.651412
(custom)
cpe:2.3:a:wnc:t-mobile_5g_box_idu:*:*:*:*:*:*:*:* |
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"description": "CWE-78 Improper neutralization of special elements used in an OS command (\u0027OS command injection\u0027)",
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"shortName": "CERT-PL"
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"tags": [
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],
"url": "https://cert.pl/posts/2026/09/CVE-2026-40854"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Command Injection in T-Mobile 5G Box IDU router via ping functionality",
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"datePublished": "2026-09-16T11:21:11.939Z",
"dateReserved": "2026-04-15T11:10:34.849Z",
"dateUpdated": "2026-09-16T11:21:11.939Z",
"state": "PUBLISHED"
},
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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