CVE-2021-47942Public exploitNetwork attack vector

Account takeover via unauthenticated path traversal

Published May 16, 2026 · Updated May 16, 2026

Path traversal in Home Assistant Community Store before 1.10.0 allows remote attackers to read files through the /hacsfiles/ endpoint. HacsFrontend passes the requested_file route value to async_serve_category_file, which appends it beneath www/community without sanitizing traversal segments. No authentication is required; reading .storage/auth exposes credentials and refresh tokens that enable forged JWTs and administrative access.

CVSS severity8.7
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Home Assistant Community Store before 1.10.0 allows remote attackers to read files through the /hacsfiles/ endpoint. HacsFrontend passes the requested_file route value to async_serve_category_file, which appends it beneath www/community without sanitizing traversal segments. No authentication is required; reading .storage/auth exposes credentials and refresh tokens that enable forged JWTs and administrative access.

The record

CVE
CVE-2021-47942
Published
May 16, 2026
Updated
May 16, 2026
Vendor
Home Assistant
Product
Home Assistant Community Store (HACS)
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 16, 2026CVE publishedPublication date reported by the CVE source.
  2. May 16, 2026Record 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=0 <1.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Home Assistant · Home Assistant Community Store (HACS)version=0 <1.10.0

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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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