Authentication Bypass in Home Assistant Konnected Integration

Compliance Impact

The vulnerability in the Konnected integration of Home Assistant allows unauthenticated local network actors to access sensitive alarm panel information without proper authentication. This exposure of sensitive security system data could lead to unauthorized disclosure of personal or security-related information.

Such unauthorized access and potential data exposure may negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of sensitive data and proper access controls to prevent unauthorized disclosure.

Specifically, the flaw allows attackers to enumerate device IDs, read switch output states, and determine alarm panel topology, which could be considered a breach of confidentiality and security controls mandated by these regulations.

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Executive Summary

The vulnerability exists in the Konnected integration of Home Assistant versions before 2026.6.0. This integration registers an HTTP endpoint called KonnectedView that is supposed to require authentication via access tokens. However, while write requests (POST and PUT) properly check for authentication tokens, read requests (GET) do not require any authentication at all.

This means that anyone on the local network can send unauthenticated GET requests to this endpoint and access sensitive alarm panel information, such as device states and zone topology, without needing a valid access token.

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Impact Analysis

This vulnerability allows unauthenticated attackers on the local network to access sensitive information about your alarm panel, including the state of switches (like sirens and relays) and the configuration of security zones.

Attackers can enumerate device IDs and map the alarm system's topology, which can help them plan physical intrusions or bypass security measures.

Additionally, the endpoint triggers unnecessary outbound connections to the Konnected hardware, which could cause interference or other unintended effects.

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Detection Guidance

This vulnerability can be detected by scanning your local network for unauthenticated access to the Konnected integration's HTTP endpoint in Home Assistant. Specifically, you can attempt to send unauthenticated GET requests to the endpoint `/api/konnected/device/{device_id}?zone=N` to see if alarm panel information is accessible without authentication.

Since the device ID space is relatively small (around 2^24), you can script or use tools like curl or wget to enumerate device IDs and check for responses.

• Example command to test access to a specific device ID and zone: `curl -X GET http://<home_assistant_ip>/api/konnected/device/123456?zone=1`
• You can automate scanning multiple device IDs with a script that iterates over possible device IDs and zones, checking for HTTP 200 responses without authentication.

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Mitigation Strategies

The immediate mitigation step is to upgrade Home Assistant to version 2026.6.0 or later, where this vulnerability is fixed by enforcing proper authentication on all requests to the Konnected integration endpoint.

Until the upgrade can be applied, restrict access to the Home Assistant instance on your local network to trusted devices only, for example by using firewall rules or network segmentation to prevent unauthorized clients from reaching the vulnerable endpoint.

Additionally, monitor network traffic for suspicious unauthenticated GET requests to the `/api/konnected/device/` endpoint and consider disabling the Konnected integration if it is not essential.

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