# CVE-2021-33718: Missing authorization in Mendix Applications using Mendix 7

> Attackers with write access to one attribute can bypass checks to modify other attributes in Mendix applications.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/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:** 13 Jul 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-rhfw-f382-2fcr

## What is CVE-2021-33718?

CVE-2021-33718 is a medium-severity missing authorization vulnerability in Siemens Mendix Applications using Mendix 7, published on 13 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability has been identified in Mendix Applications using Mendix 7 (All versions < V7.23.22), Mendix Applications using Mendix 8 (All versions < V8.18.7), Mendix Applications using Mendix 9 (All versions < V9.3.0). Write access checks of attributes of an object could be bypassed, if user has a write permissions to the first attribute of this object.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2021-33718?

It affects 1 product.


Products: Siemens Mendix.

## How do I fix CVE-2021-33718?

No fix has been published for CVE-2021-33718 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-33718 being exploited?

There is no known exploitation of CVE-2021-33718 in the wild and no public exploit code.

## Other vulnerabilities in Siemens Mendix Applications using Mendix 7

- [CVE-2023-45794](https://insights.sbomify.com/CVE-2023-45794/): Missing authorization in Mendix Applications using Mendix 10 (medium 6.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-33718 and fix it if it is affected.

What it is: CVE-2021-33718 is a medium-severity missing authorization vulnerability in Siemens Mendix Applications using Mendix 7, published on 13 Jul 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-2021-33718 in the wild and no public exploit code.

Affected product: Siemens Mendix Applications using Mendix 7. 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-2021-33718/ (Markdown: https://insights.sbomify.com/CVE-2021-33718/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-33718
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-33718
- OSV: https://osv.dev/vulnerability/CVE-2021-33718

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-33718/
Summaries are generated and may contain mistakes; the official description above is the record.