# CVE-2018-25396: Heatmiser Wifi Thermostat 1.7 Credential Disclosure via networkSetup.htm

> Unauthenticated attackers can retrieve administrative credentials from the networkSetup.htm page to gain full control of the Heatmiser Wifi Thermostat.

- **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:** 29 May 2026
- **Updated:** 28 Jul 2026
- **Also known as:** GHSA-g2j8-j26j-56qh

## What is CVE-2018-25396?

CVE-2018-25396 is a high-severity vulnerability in Heatmiser Wifi Thermostat, published on 29 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Heatmiser Wifi Thermostat 1.7 contains a credential disclosure vulnerability that allows unauthenticated attackers to retrieve administrative credentials by accessing the networkSetup.htm page. Attackers can request the networkSetup.htm endpoint and extract plaintext username and password values from HTML form fields to gain administrative access to the thermostat.

Weakness: CWE-256 (Plaintext Storage of a Password)

## Which versions are affected by CVE-2018-25396?


## How do I fix CVE-2018-25396?

No fix has been published for CVE-2018-25396 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-25396 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-25396 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-25396 and fix it if it is affected.

What it is: CVE-2018-25396 is a high-severity vulnerability in Heatmiser Wifi Thermostat, published on 29 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-2018-25396 exists.

Affected product: Heatmiser Wifi Thermostat. 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-2018-25396/ (Markdown: https://insights.sbomify.com/CVE-2018-25396/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-25396
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-25396
- OSV: https://osv.dev/vulnerability/CVE-2018-25396

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-25396/
Summaries are generated and may contain mistakes; the official description above is the record.