{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2026-3611","assignerOrgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","state":"PUBLISHED","assignerShortName":"icscert","dateReserved":"2026-03-05T18:12:38.425Z","datePublished":"2026-03-12T20:06:05.753Z","dateUpdated":"2026-03-30T15:26:08.604Z"},"containers":{"cna":{"providerMetadata":{"orgId":"7d14cffa-0d7d-4270-9dc0-52cabd5a23a6","shortName":"icscert","dateUpdated":"2026-03-30T15:26:08.604Z"},"title":"Honeywell IQ4x BMS Controller Missing authentication for critical function","datePublic":"2026-03-10T17:00:00.000Z","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-306","description":"CWE-306 Missing authentication for critical function","type":"CWE"}]}],"affected":[{"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"}],"descriptions":[{"lang":"en","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.","supportingMedia":[{"type":"text/html","base64":false,"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."}]}],"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"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"HIGH","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"CRITICAL","baseScore":10,"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"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"CRITICAL","baseScore":10,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"}}],"workarounds":[{"lang":"en","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).","supportingMedia":[{"type":"text/html","base64":false,"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)."}]}],"credits":[{"lang":"en","value":"Gjoko Krstic of Zero Science reported this vulnerability to Honeywell.","type":"finder"}],"source":{"advisory":"ICSA-26-069-03","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-13T18:02:46.954644Z","id":"CVE-2026-3611","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-03-13T18:03:02.081Z"}}]},"dataVersion":"5.2"}