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.
Casky was already ahead
This CVE exploits attack patterns that Casky's 331matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.
CVE-2021-47942 is a path traversal vulnerability in Home Assistant Community Store (HACS) version 1.10.0 that allows unauthenticated attackers to bypass directory restrictions and access sensitive files on affected systems. By exploiting the /hacsfiles/ endpoint, adversaries can traverse the file system to retrieve the .storage/auth file, which contains user credentials and refresh tokens. This matters because Home Assistant is a popular open-source home automation platform, and gaining access to authentication tokens enables attackers to create valid JWT tokens and assume administrative control of Home Assistant instances. Any organization or individual running HACS 1.10.0 without proper network segmentation is at risk of unauthorized access to their home automation infrastructure and potentially connected IoT devices.
Casky's 331 matching skills leverage Claude's extended reasoning to detect the attack patterns behind this CVE by analyzing two critical MITRE ATT&CK techniques: TA0001 (Initial Access) and TA0007 (Discovery). Practitioners using Casky would identify initial access attempts through suspicious requests to the /hacsfiles/ endpoint with path traversal payloads (../ sequences targeting .storage/auth), and discovery activities indicating reconnaissance of the file system structure. The platform's skills would correlate anomalous unauthenticated HTTP requests with subsequent JWT token generation and authentication events, surfacing the full attack chain. Practitioners would see findings flagging failed authorization checks on sensitive endpoints, unexpected file access patterns outside normal HACS operations, and rapid escalation from unauthenticated access to privileged token creation—enabling detection before administrative compromise occurs.
Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →
These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2021-47942.
Casky has 331 skills that investigate the attack patterns behind CVE-2021-47942. Run one and get CVSS-scored findings in 3 minutes.
Run the skill that detects this →analyzing-office365-audit-logs-for-compromise
cloud security · low
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testing-websocket-api-security
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triaging-vulnerabilities-with-ssvc-framework
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