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

To clipboard

{
  "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: 2026-03-13 18:03

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

CWE

CWE-306 - Missing authentication for critical function

Assigner

icscert

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

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

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-3611",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-13T18:02:46.954644Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-13T18:03:02.081Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "IQ4E",
          "vendor": "Honeywell",
          "versions": [
            {
              "lessThanOrEqual": "4.36 (build 4.3.7.9)",
              "status": "affected",
              "version": "v3.50_3.44",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "IQ412",
          "vendor": "Honeywell",
          "versions": [
            {
              "lessThanOrEqual": "4.36 (build 4.3.7.9)",
              "status": "affected",
              "version": "v3.50_3.44",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "IQ422",
          "vendor": "Honeywell",
          "versions": [
            {
              "lessThanOrEqual": "4.36 (build 4.3.7.9)",
              "status": "affected",
              "version": "v3.50_3.44",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "IQ4NC",
          "vendor": "Honeywell",
          "versions": [
            {
              "lessThanOrEqual": "4.36 (build 4.3.7.9)",
              "status": "affected",
              "version": "v3.50_3.44",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "IQ41x",
          "vendor": "Honeywell",
          "versions": [
            {
              "lessThanOrEqual": "4.36 (build 4.3.7.9)",
              "status": "affected",
              "version": "v3.50_3.44",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "IQ3",
          "vendor": "Honeywell",
          "versions": [
            {
              "lessThanOrEqual": "4.36 (build 4.3.7.9)",
              "status": "affected",
              "version": "v3.50_3.44",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "IQECO",
          "vendor": "Honeywell",
          "versions": [
            {
              "lessThanOrEqual": "4.36 (build 4.3.7.9)",
              "status": "affected",
              "version": "v3.50_3.44",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Gjoko Krstic of Zero Science reported this vulnerability to Honeywell."
        }
      ],
      "datePublic": "2026-03-10T17:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "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."
            }
          ],
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-306",
              "description": "CWE-306 Missing authentication for critical function",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-12T20:06:05.753Z",
        "orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
        "shortName": "icscert"
      },
      "references": [
        {
          "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-069-03"
        },
        {
          "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-069-03.json"
        },
        {
          "url": "https://www.honeywell.com/us/en/contact"
        }
      ],
      "source": {
        "advisory": "ICSA-26-069-03",
        "discovery": "EXTERNAL"
      },
      "title": "Honeywell IQ4x BMS Controller Missing authentication for critical function",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Honeywell is aware of the issue, but has not released a fix. For more \ninformation, contact Honeywell directly. \n[https://www.honeywell.com/us/en/contact](https://www.honeywell.com/us/en/contact)."
            }
          ],
          "value": "Honeywell is aware of the issue, but has not released a fix. For more \ninformation, contact Honeywell directly. \n[https://www.honeywell.com/us/en/contact](https://www.honeywell.com/us/en/contact)."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 1.0.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6",
    "assignerShortName": "icscert",
    "cveId": "CVE-2026-3611",
    "datePublished": "2026-03-12T20:06:05.753Z",
    "dateReserved": "2026-03-05T18:12:38.425Z",
    "dateUpdated": "2026-03-13T18:03:02.081Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-3P4G-VG78-JQRV

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

Tags

Sightings

Nomenclature