# CVE-2018-7783: XML external entity in SoMachine Basic

> An attacker can exploit an XML External Entity vulnerability in SoMachine Basic to disclose and retrieve arbitrary data from the affected system via an out-of-band attack.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Jul 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-cm3h-688r-2c3x

## What is CVE-2018-7783?

CVE-2018-7783 is a high-severity vulnerability in Schneider Electric SE SoMachine Basic, published on 3 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Schneider Electric SoMachine Basic prior to v1.6 SP1 suffers from an XML External Entity (XXE) vulnerability using the DTD parameter entities technique resulting in disclosure and retrieval of arbitrary data on the affected node via out-of-band (OOB) attack. The vulnerability is triggered when input passed to the xml parser is not sanitized while parsing the xml project/template file.

Weakness: CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2018-7783?

It affects 1 product.


Products: Schneider-Electric Somachine Basic.

## How do I fix CVE-2018-7783?

No fix has been published for CVE-2018-7783 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-7783 being exploited?

There is no known exploitation of CVE-2018-7783 in the wild and no public exploit code.

## Other vulnerabilities in Schneider Electric SE SoMachine Basic

- [CVE-2018-7798](https://insights.sbomify.com/CVE-2018-7798/): Missing authorization in Modicon M221, All Versions (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-7783 and fix it if it is affected.

What it is: CVE-2018-7783 is a high-severity vulnerability in Schneider Electric SE SoMachine Basic, published on 3 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2018-7783 in the wild and no public exploit code.

Affected product: Schneider Electric SE SoMachine Basic. 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-2018-7783/ (Markdown: https://insights.sbomify.com/CVE-2018-7783/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7783
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7783
- OSV: https://osv.dev/vulnerability/CVE-2018-7783

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-7783/
Summaries are generated and may contain mistakes; the official description above is the record.