# CVE-2026-82790: Cross-site scripting in PC-HELPER Wireless I/O DIO-0404RY-LWF

> Cross-site scripting allows arbitrary script execution in a logged-in user's browser on Contec PC-HELPER Wireless I/O modules.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Sep 2026
- **Updated:** 14 Sep 2026
- **Also known as:** GHSA-4p6h-654m-8phx

## What is CVE-2026-82790?

CVE-2026-82790 is a medium-severity cross-site scripting vulnerability in Contec Co., Ltd. PC-HELPER Wireless I/O DIO-0404RY-LWF, published on 14 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Cross-site scripting vulnerability exists in PC-HELPER Wireless I/O DIO-0404RY-LWF and PC-HELPER Wireless I/O DIO-0404RY-LWF-US. If this vulnerability is exploited, an arbitrary script may be executed on a logged-in user's web browser.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-82790?


## How do I fix CVE-2026-82790?

No fix has been published for CVE-2026-82790 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-82790 being exploited?

There is no known exploitation of CVE-2026-82790 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-82790 and fix it if it is affected.

What it is: CVE-2026-82790 is a medium-severity cross-site scripting vulnerability in Contec Co., Ltd. PC-HELPER Wireless I/O DIO-0404RY-LWF, published on 14 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-82790 in the wild and no public exploit code.

Affected product: Contec Co., Ltd. PC-HELPER Wireless I/O DIO-0404RY-LWF. 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-2026-82790/ (Markdown: https://insights.sbomify.com/CVE-2026-82790/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-82790
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-82790
- OSV: https://osv.dev/vulnerability/CVE-2026-82790

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-82790/
Summaries are generated and may contain mistakes; the official description above is the record.