# CVE-2020-35557: Improper Access Validation in products of MB connect line and Helmholz

> A logged-in user can view devices belonging to other accounts due to improper access validation in MB connect line and Helmholz industrial IoT products.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Feb 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-4jrw-3q8x-9gpf

## What is CVE-2020-35557?

CVE-2020-35557 is a medium-severity missing authorization vulnerability in n/a, published on 16 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

An issue in MB connect line mymbCONNECT24, mbCONNECT24 and Helmholz myREX24 and myREX24.virtual in all versions through v2.11.2 allows a logged in user to see devices in the account he should not have access to due to improper use of access validation.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2020-35557?

It affects 4 products.


Products: Helmholz Myrex24, Helmholz Myrex24.virtual, Mbconnectline Mbconnect24, Mbconnectline Mymbconnect24.

## How do I fix CVE-2020-35557?

No fix has been published for CVE-2020-35557 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35557 being exploited?

There is no known exploitation of CVE-2020-35557 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2020-35558](https://insights.sbomify.com/CVE-2020-35558/): SSRF in products of MB connect line and Helmholz (high 7.5)
- [CVE-2020-12527](https://insights.sbomify.com/CVE-2020-12527/): Improper Access Validation in products of MB connect line and Helmholz (medium 6.5)
- [CVE-2022-22520](https://insights.sbomify.com/CVE-2022-22520/): User enumeration vulnerability in MB connect line and Helmholz products (medium 5.3)
- [CVE-2020-35561](https://insights.sbomify.com/CVE-2020-35561/): SSRF in variuos products of MB connect line and Helmholz (medium 5.3)
- [CVE-2020-35566](https://insights.sbomify.com/CVE-2020-35566/): Local file inclusion vulnerability in products of MB connect line and Helmholz (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35557 and fix it if it is affected.

What it is: CVE-2020-35557 is a medium-severity missing authorization vulnerability in n/a, published on 16 Feb 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2020-35557 in the wild and no public exploit code.

Affected product: n/a. 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-2020-35557/ (Markdown: https://insights.sbomify.com/CVE-2020-35557/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35557
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35557
- OSV: https://osv.dev/vulnerability/CVE-2020-35557

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-35557/
Summaries are generated and may contain mistakes; the official description above is the record.