Vulnerability-Lookup

GHSA-3P4G-VG78-JQRV

Vulnerability from github – Published: 2026-03-12 21:34 – Updated: 2026-03-12 21:34

Details

The Honeywell IQ4x building management controller, exposes its full web-based HMI without authentication in its factory-default configuration. With no user module configured, security is disabled by design and the system operates under a System Guest (level 100) context, granting read/write privileges to any party able to reach the HTTP interface. Authentication controls are only enforced after a web user is created via U.htm, which dynamically enables the user module. Because this function is accessible prior to authentication, a remote user can create a new account with administrative read/write permissions enabling the user module and imposing authentication under attacker-controlled credentials. This action can effectively lock legitimate operators out of local and web-based configuration and administration.

Severity

10.0 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

10.0 (Critical)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-3611"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-306"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-03-12T21:16:27Z",
    "severity": "CRITICAL"
  },
  "details": "The Honeywell IQ4x building management controller, exposes its full web-based HMI without authentication in its factory-default configuration. With no user module configured, security is disabled by design and the system operates under a System Guest (level 100) context, granting read/write privileges to any party able to reach the HTTP interface. Authentication controls are only enforced after a web user is created via U.htm, which dynamically enables the user module. Because this function is accessible prior to authentication, a remote user can create a new account with administrative read/write permissions enabling the user module and imposing authentication under attacker-controlled credentials. This action can effectively lock legitimate operators out of local and web-based configuration and administration.",
  "id": "GHSA-3p4g-vg78-jqrv",
  "modified": "2026-03-12T21:34:51Z",
  "published": "2026-03-12T21:34:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3611"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-069-03.json"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-069-03"
    },
    {
      "type": "WEB",
      "url": "https://www.honeywell.com/us/en/contact"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-3611 (GCVE-0-2026-3611)

Vulnerability from cvelistv5 – Published: 2026-03-12 20:06 – Updated: 2026-03-30 15:26

Title

Honeywell IQ4x BMS Controller Missing authentication for critical function

Summary

Severity

10 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-13 18:02 UTC

CWE

CWE-306 - Missing authentication for critical function

Assigner

icscert icscert root

References

3 references

URL	Tags
https://www.cisa.gov/news-events/ics-advisories/i…
https://github.com/cisagov/CSAF/blob/develop/csaf…
https://www.honeywell.com/us/en/contact

Impacted products

7 products

Vendor	Product	Version
Honeywell	IQ4E	Affected: v3.50_3.44 , ≤ 4.36 (build 4.3.7.9) (custom)
Honeywell	IQ412	Affected: v3.50_3.44 , ≤ 4.36 (build 4.3.7.9) (custom)
Honeywell	IQ422	Affected: v3.50_3.44 , ≤ 4.36 (build 4.3.7.9) (custom)
Honeywell	IQ4NC	Affected: v3.50_3.44 , ≤ 4.36 (build 4.3.7.9) (custom)
Honeywell	IQ41x	Affected: v3.50_3.44 , ≤ 4.36 (build 4.3.7.9) (custom)
Honeywell	IQ3	Affected: v3.50_3.44 , ≤ 4.36 (build 4.3.7.9) (custom)
Honeywell	IQECO	Affected: v3.50_3.44 , ≤ 4.36 (build 4.3.7.9) (custom)

Date Public

2026-03-10 17:00

Credits

Gjoko Krstic of Zero Science reported this vulnerability to Honeywell.

Show details on NVD website

JSON

To clipboard

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                  },
                  {
                    "Technical Impact": "total"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-03-13T18:02:46.954644Z",
                "version": "2.0.3"
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        },
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          "defaultStatus": "unaffected",
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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.

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.

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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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GHSA-3P4G-VG78-JQRV

CVE-2026-3611 (GCVE-0-2026-3611)

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Sightings

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