Home-Assistant Home Assistant Community Store up to 1.9.x Refresh Token /hacsfiles/ path traversal

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Home-Assistant Home Assistant Community Store up to 1.9.x. The affected element is an unknown function of the file /hacsfiles/ of the component Refresh Token Handler. Performing a manipulation results in path traversal. This vulnerability is cataloged as CVE-2021-47942. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Home-Assistant Home Assistant Community Store up to 1.9.x. This affects some unknown functionality of the file /hacsfiles/ of the component Refresh Token Handler. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality. The summary by CVE is:

Home Assistant Community Store (HACS) 1.10.0 contains a path traversal vulnerability that allows unauthenticated attackers to read sensitive files by traversing directories via the /hacsfiles/ endpoint. Attackers can retrieve the .storage/auth file containing user credentials and refresh tokens, then craft valid JWT tokens to gain administrative access to Home Assistant instances.

The weakness was shared by Lyghtnox as 49495. It is possible to read the advisory at exploit-db.com. This vulnerability is uniquely identified as CVE-2021-47942 since 02/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept.

Upgrading to version 1.10.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2021-34838). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Home Assistant Community Store 1.10.0

Timelineinfo

02/01/2026 CVE reserved
05/16/2026 +103 days Advisory disclosed
05/16/2026 +0 days VulDB entry created
05/17/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: 49495
Researcher: Lyghtnox
Status: Confirmed

CVE: CVE-2021-47942 (🔒)
GCVE (CVE): GCVE-0-2021-47942
GCVE (VulDB): GCVE-100-364359
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/16/2026 18:11
Updated: 05/17/2026 02:06
Changes: 05/16/2026 18:11 (82), 05/17/2026 02:06 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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