# CVE-2020-35949: File upload in n/a

> Unauthenticated attackers can upload arbitrary PHP files by bypassing Content-Type checks, leading to remote code execution on WordPress sites using the Quiz and Survey Master plugin.

- **Severity:** Critical 10.0 (`CVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:C/UI:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Jan 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-j7g6-6g73-449h

## What is CVE-2020-35949?

CVE-2020-35949 is a critical vulnerability in n/a, published on 1 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in the Quiz and Survey Master plugin before 7.0.1 for WordPress. It made it possible for unauthenticated attackers to upload arbitrary files and achieve remote code execution. If a quiz question could be answered by uploading a file, only the Content-Type header was checked during the upload, and thus the attacker could use text/plain for a .php file.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2020-35949?

It affects 1 product.


Products: Expresstech Quiz and Survey Master.

## How do I fix CVE-2020-35949?

No fix has been published for CVE-2020-35949 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-35949 being exploited?

There is no known exploitation of CVE-2020-35949 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-3592](https://insights.sbomify.com/CVE-2024-3592/): SQL injection in Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker (critical 9.9)
- [CVE-2020-35951](https://insights.sbomify.com/CVE-2020-35951/): Missing authorization in n/a (critical 9.9)
- [CVE-2024-5606](https://insights.sbomify.com/CVE-2024-5606/): Quiz And Survey Master < 9.0.2 - Contributor+ SQLi (high 8.8)
- [CVE-2022-0180](https://insights.sbomify.com/CVE-2022-0180/): Cross-site request forgery in Quiz And Survey Master (high 8.8)
- [CVE-2021-24221](https://insights.sbomify.com/CVE-2021-24221/): Quiz And Survey Master < 7.1.12 - Authenticated SQL injection via shortcode (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-35949 and fix it if it is affected.

What it is: CVE-2020-35949 is a critical vulnerability in n/a, published on 1 Jan 2021. 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-2020-35949 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-2020-35949/ (Markdown: https://insights.sbomify.com/CVE-2020-35949/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-35949
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-35949
- OSV: https://osv.dev/vulnerability/CVE-2020-35949

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-35949/
Summaries are generated and may contain mistakes; the official description above is the record.