# CVE-2026-5667: Information Disclosure, Information Tampering, or Denial-of-Service (DoS) Vulnerability in Multiple Home Appliances

> Attackers within Wi-Fi range can access Mitsubishi home appliances using hard-coded credentials to read data, modify settings, or cause denial of service.

- **Severity:** High 7.2 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Jun 2026
- **Updated:** 17 Jun 2026
- **Also known as:** GHSA-v4fv-4v3p-rhf8

## What is CVE-2026-5667?

CVE-2026-5667 is a high-severity vulnerability in Mitsubishi Electric Corporation Adapters for Airflow Ventilation Systems, Heat Pump Chilled/Hot Water Systems, and Ventilation/Air-Conditioning System Air Resorts (for Japan) HM-01A-EX, published on 17 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Use of Hard-coded Credentials vulnerability in Mitsubishi Electric Room Air Conditioners (for Japan and outside Japan); Wireless LAN Adapters for Room Air Conditioners (for Japan and outside Japan); Wireless LAN Adapters for Packaged Air Conditioners (for Japan and outside Japan); Refrigerators (for Japan); Heat Pump Water Heaters / HEMS-Compatible Adapters / Wireless LAN Adapters (for Japan); Bathroom Dryer / Heater / Ventilation Systems (for Japan); Adapters for Airflow Ventilation Systems, Heat Pump Chilled / Hot Water Systems, and Ventilation / Air-Conditioning System Air Resorts (for Japan); Lossnay Central Ventilation Systems (for Japan); Smart Switches for Ventilation Fans and Lossnay (for Japan); IH Cooking Heaters (for Japan); and Rice Cookers (for Japan) allows an attacker within Wi-Fi radio range of an affected product to access the affected product using a hard-coded SSID and password, thereby obtaining device data such as operation status, room set temperature, and room temperature; changing the air-conditioner or Wi-Fi settings; or causing Wi-Fi communication to enter a denial-of-service (DoS) condition.

Weakness: CWE-798 (Use of Hard-coded Credentials)

## Which versions are affected by CVE-2026-5667?


## How do I fix CVE-2026-5667?

No fix has been published for CVE-2026-5667 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-5667 being exploited?

There is no known exploitation of CVE-2026-5667 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-5667 and fix it if it is affected.

What it is: CVE-2026-5667 is a high-severity vulnerability in Mitsubishi Electric Corporation Adapters for Airflow Ventilation Systems, Heat Pump Chilled/Hot Water Systems, and Ventilation/Air-Conditioning System Air Resorts (for Japan) HM-01A-EX, published on 17 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-5667 in the wild and no public exploit code.

Affected product: Mitsubishi Electric Corporation Adapters for Airflow Ventilation Systems, Heat Pump Chilled/Hot Water Systems, and Ventilation/Air-Conditioning System Air Resorts (for Japan) HM-01A-EX. 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-2026-5667/ (Markdown: https://insights.sbomify.com/CVE-2026-5667/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-5667
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5667
- OSV: https://osv.dev/vulnerability/CVE-2026-5667

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-5667/
Summaries are generated and may contain mistakes; the official description above is the record.