CVE-2026-59177 PoC — ESPHome Device Builder allows unauthenticated dashboard access via the HA add-on ingress site bound to all interfaces

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-59177.yaml

Associated Vulnerability

Title: ESPHome Device Builder allows unauthenticated dashboard access via the HA add-on ingress site bound to all interfaces (CVE-2026-59177)
Description:ESPHome Device Builder Dashboard is a dashboard for the ESPHome home management software. Prior to 1.0.10, the `Home Assistant` add-on's trusted `ingress` site binds to `0.0.0.0` while intentionally skipping dashboard authentication because the supervisor is expected to authenticate requests upstream. Host networking, required for mDNS, also binds this no-auth site to the `Home Assistant` host's LAN interface. Any device on that local network can therefore connect directly to the `ingress` port, bypass the supervisor, and obtain the full dashboard without credentials or operator misconfiguration. Dashboard capability includes compile-time Python execution through `external_components:`, shell execution through compile and validation subprocesses, and arbitrary access to configuration and data files, compromising the mounted `Home Assistant` configuration and managed ESPHome devices. The standalone Docker dashboard and the password-gated public port 6052 are not affected. This issue is fixed in version 1.0.10.

Description

ESPHome Device Builder versions before 1.0.10 bind the trusted Home Assistant ingress site to all interfaces. A client that can reach the ingress port can therefore access the dashboard without the Supervisor's authentication proxy.

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