# CVE-2021-47942: Home Assistant Community Store 1.10.0 Path Traversal Account Takeover

> Unauthenticated attackers can read sensitive auth files via path traversal to craft JWT tokens and gain administrative access to Home Assistant instances.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 May 2026
- **Updated:** 14 Aug 2026
- **Also known as:** GHSA-cqg8-v99m-gv9m

## What is CVE-2021-47942?

CVE-2021-47942 is a high-severity path traversal vulnerability in Home-Assistant Home Assistant Community Store (HACS), published on 16 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Home Assistant Community Store (HACS) prior to 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.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2021-47942?

It affects 1 product.


Products: Hacs Home Assistant Community Store.

## How do I fix CVE-2021-47942?

No fix has been published for CVE-2021-47942 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47942 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47942 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47942 and fix it if it is affected.

What it is: CVE-2021-47942 is a high-severity path traversal vulnerability in Home-Assistant Home Assistant Community Store (HACS), published on 16 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47942 exists.

Affected product: Home-Assistant Home Assistant Community Store (HACS). No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2021-47942/ (Markdown: https://insights.sbomify.com/CVE-2021-47942/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47942
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47942
- OSV: https://osv.dev/vulnerability/CVE-2021-47942

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47942/
Summaries are generated and may contain mistakes; the official description above is the record.