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CVE-2026-3611— Honeywell IQ4x BMS Controller Missing authentication for critical function

Quick assessment

Affected
Honeywell IQ4E
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Honeywell IQ4x是美国Honeywell公司的一系列楼宇自动化系统中的网络控制器。 Honeywell IQ4x存在访问控制错误漏洞，该漏洞源于默认配置下未启用身份验证，可能导致远程用户创建具有管理权限的账户。

CVSS 10.0 · Critical EPSS 0.99% · P61
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I. Basic Information for CVE-2026-3611

Vulnerability Information
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Vulnerability Title
Honeywell IQ4x BMS Controller Missing authentication for critical function
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Honeywell IQ4x 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Honeywell IQ4x是美国Honeywell公司的一系列楼宇自动化系统中的网络控制器。 Honeywell IQ4x存在访问控制错误漏洞，该漏洞源于默认配置下未启用身份验证，可能导致远程用户创建具有管理权限的账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Honeywell IQ4E v3.50_3.44 ~ 4.36 (build 4.3.7.9) -
Honeywell IQ412 v3.50_3.44 ~ 4.36 (build 4.3.7.9) -
Honeywell IQ422 v3.50_3.44 ~ 4.36 (build 4.3.7.9) -
Honeywell IQ4NC v3.50_3.44 ~ 4.36 (build 4.3.7.9) -
Honeywell IQ41x v3.50_3.44 ~ 4.36 (build 4.3.7.9) -
Honeywell IQ3 v3.50_3.44 ~ 4.36 (build 4.3.7.9) -
Honeywell IQECO v3.50_3.44 ~ 4.36 (build 4.3.7.9) -

II. Public POCs for CVE-2026-3611

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III. Intelligence Information for CVE-2026-3611

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Vendor Advisories for CVE-2026-3611 (2)

Other References for CVE-2026-3611 (1)

IV. Related Vulnerabilities

Same vendor: Honeywell
Same weakness: CWE-306

V. Comments for CVE-2026-3611

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