CVE-2026-3611

🗓️ 12 Mar 2026 20:06:05Reported by icscertType

cve🔗 web.nvd.nist.gov👁 114 Views🌐 WEB

Honeywell IQ4x controller exposes web HMI without authentication in factory default, enabling attacker account

Reporter	Title	Published	Views	Family All 15
attackerkb	CVE-2026-3611	12 Mar 202620:06	–	attackerkb
GithubExploit	building_automation_system_guardian	3 Aug 202602:31	–	githubexploit
BDU FSTEC	Honeywell IQ4 PLC Authentication Bypass	17 Jul 202600:00	–	bdu_fstec
Circl	CVE-2026-3611	10 Mar 202611:00	–	circl
CNNVD	Honeywell IQ4x Access Control Vulnerability	12 Mar 202600:00	–	cnnvd
Cvelist	CVE-2026-3611 Honeywell IQ4x BMS Controller Missing authentication for critical function	12 Mar 202620:06	–	cvelist
EUVD	EUVD-2026-11706	12 Mar 202621:34	–	euvd
ICS	Honeywell IQ4 Series BMS Controller (Update A)	10 Mar 202606:00	–	ics
Kitploit	BAS-Guardian — Updated!	2 Sep 202623:59	–	kitploit
NVD	CVE-2026-3611	12 Mar 202621:16	–	nvd

NVD

Vulners

Node

AND

honeywell iq4e_firmwareRange<3.30

honeywell iq4eMatch-

Node

AND

honeywell iq412_firmwareRange<3.30

honeywell iq412Match-

Node

AND

honeywell iq422_firmwareRange<3.30

honeywell iq422Match-

Node

AND

honeywell iq4nc_firmwareRange<3.30

honeywell iq4ncMatch-

Node

AND

honeywell iq41x_firmwareRange<3.30

honeywell iq41xMatch-

[
  {
    "vendor": "Honeywell",
    "product": "IQ4E",
    "versions": [
      {
        "status": "affected",
        "version": "v3.50_3.44",
        "lessThanOrEqual": "4.36 (build 4.3.7.9)",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Honeywell",
    "product": "IQ412",
    "versions": [
      {
        "status": "affected",
        "version": "v3.50_3.44",
        "lessThanOrEqual": "4.36 (build 4.3.7.9)",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Honeywell",
    "product": "IQ422",
    "versions": [
      {
        "status": "affected",
        "version": "v3.50_3.44",
        "lessThanOrEqual": "4.36 (build 4.3.7.9)",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Honeywell",
    "product": "IQ4NC",
    "versions": [
      {
        "status": "affected",
        "version": "v3.50_3.44",
        "lessThanOrEqual": "4.36 (build 4.3.7.9)",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Honeywell",
    "product": "IQ41x",
    "versions": [
      {
        "status": "affected",
        "version": "v3.50_3.44",
        "lessThanOrEqual": "4.36 (build 4.3.7.9)",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Honeywell",
    "product": "IQ3",
    "versions": [
      {
        "status": "affected",
        "version": "v3.50_3.44",
        "lessThanOrEqual": "4.36 (build 4.3.7.9)",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  },
  {
    "vendor": "Honeywell",
    "product": "IQECO",
    "versions": [
      {
        "status": "affected",
        "version": "v3.50_3.44",
        "lessThanOrEqual": "4.36 (build 4.3.7.9)",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

Source	Link
cisa	www.cisa.gov/news-events/ics-advisories/icsa-26-069-03
github	www.github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-069-03.json
honeywell	www.honeywell.com/us/en/contact

Parameter	Position	Path	Description	CWE
Action	request body	/confirmAction.htm	Unauthenticated enabling of the User module by creating a new user strategy, enabling authentication and admin access.	CWE-306
ActionModuleEntireReference	request body	/confirmAction.htm	Unauthenticated enabling of the User module by creating a new user strategy, enabling authentication and admin access.	CWE-306
ActionFields	request body	/confirmAction.htm	Unauthenticated enabling of the User module by creating a new user strategy, enabling authentication and admin access.	CWE-306
ActionTextualPrompt	request body	/confirmAction.htm	Unauthenticated enabling of the User module by creating a new user strategy, enabling authentication and admin access.	CWE-306
ActionCompletionURL	request body	/confirmAction.htm	Unauthenticated enabling of the User module by creating a new user strategy, enabling authentication and admin access.	CWE-306
ActionRejectionURL	request body	/confirmAction.htm	Unauthenticated enabling of the User module by creating a new user strategy, enabling authentication and admin access.	CWE-306
ovrideStart	request body	/confirmAction.htm	Unauthenticated enabling of the User module by creating a new user strategy, enabling authentication and admin access.	CWE-306
ServerCommand	request body	/U.htm	Unauthenticated creation of credentials for a new administrative user via U.htm.	CWE-306
ModuleFullName	request body	/U.htm	Unauthenticated creation of credentials for a new administrative user via U.htm.	CWE-306
U0($)newVal	request body	/U.htm	Unauthenticated creation of credentials for a new administrative user via U.htm.	CWE-306

17 Jun 2026 10:43Current

8.1High risk

Vulners AI Score8.1

CVSS 3.110

CVSS 410

EPSS0.01025

SSVC

CWE-306