CVE-2026-3611 | BDVDB-2026-320146 Detail

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.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-03-12Record published in the CVE List.
2. Version 22026-03-30Most recent update recorded in the CVE List.