CVE-2023-27482Public exploitNetwork attack vector

Unauthenticated API access via double-decoded path traversal

Published Mar 8, 2023 · Updated Feb 25, 2025

Authentication bypass in Home Assistant Core before 2023.3.2 and Supervisor before 2023.03.3 allows remote attackers to access the Supervisor API. The HassIO proxy exempts app paths from authentication before aiohttp decodes and normalizes a doubly encoded traversal into a protected API path. A network-reachable OS or Supervised installation is sufficient to expose backups and secrets and permit root command execution; standalone Core and Container installations are unaffected.

CVSS severity10.0
Critical
EPSS probability71.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Home Assistant Core before 2023.3.2 and Supervisor before 2023.03.3 allows remote attackers to access the Supervisor API. The HassIO proxy exempts app paths from authentication before aiohttp decodes and normalizes a doubly encoded traversal into a protected API path. A network-reachable OS or Supervised installation is sufficient to expose backups and secrets and permit root command execution; standalone Core and Container installations are unaffected.

The record

CVE
CVE-2023-27482
Published
Mar 8, 2023
Updated
Feb 25, 2025
Vendor
Home Assistant
Product
Home Assistant Supervisor
Classifications
CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2023.03.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant Supervisorversion=< 2023.03.3
Home Assistant · Home Assistant Coreversion=< 2023.3.2

Published CVSS scores

10.0NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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