CVE-2026-3611
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 b...
Affects 0 products across 2 vendors.
Software does not perform any authentication for functionality that requires a verified identity.
Mapping is CWE-to-CAPEC per MITRE CAPEC 3.9.
The Honeywell IQ4x building management controller exposes its full web-based HMI without authentication in its factory-default configuration, allowing unauthenticated access with full read/write privileges. This can lead to unauthorized control and potential denial of service for legitimate operators.
BSID: BS-2026-GLOBAL-152032-C • Model: Qwen/Qwen2.5-72B-Instruct-AWQ • Confidence: HIGH
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| CVE ID | CVE-2026-3611 |
|---|---|
| BSID | BS-2026-GLOBAL-152032-C BreachSpider Global ID |
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| Published | 2026-03-12 |
| Last Modified | 2026-03-13 |
| ICS Relevance | 80% |
| Weakness (CWE) | |
| Verticals | |
| Source | NVD |
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: NIST NVD / MITRE CVE Database
The vulnerability exists due to the lack of authentication controls in the factory-default configuration of the Honeywell IQ4x building management controller. An attacker can access the web-based HMI and create a new account with administrative privileges, effectively locking out legitimate operators.
Exploitation Likelihood: MEDIUM
| CISA KEV | Not in KEV catalog |
|---|---|
| Public Exploit | Not confirmed |
| PoC Code | Not confirmed |
Implement network segmentation to isolate the Honeywell IQ4x controller from untrusted networks and apply strict access controls to limit who can reach the HTTP interface.
This CVE violates CIP-007-R2 because it allows unauthorized access to the control system, which could compromise the security of the electronic security perimeter.
This CVE maps to SR 7.6 because it involves the lack of proper authentication mechanisms, which is essential for protecting against unauthorized access to the control system.
Virtual patch generated by CITED Relevance SAGE. Validate in isolated environment before production deployment. Compensating control only - does not replace vendor patch.
SAGE Enrichment Record — provenance & audit hash
| Model | Qwen/Qwen2.5-72B-Instruct-AWQ |
|---|---|
| Confidence | HIGH |
| Enriched At | 2026-05-24 |
| SHA-512 Audit Hash | 14691bee585268ff391abfe0b1278d1132129c7f34fce7db05b752b7a8779873b982aed058a8a57e9cbf15fa35c505448f3b2f68d3dbf226624f33f1a9e63602 |
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