# CVE-2021-36906: WordPress Quiz And Survey Master plugin <= 7.3.6 - Multiple Insecure direct object references (IDOR) vulnerabilities

> Attackers can access or modify other users' quiz data by manipulating object references, requiring plugin updates.

- **Severity:** Low 2.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 3 Nov 2022
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-9cgg-xr6f-vrg8

## What is CVE-2021-36906?

CVE-2021-36906 is a low-severity missing authorization vulnerability in ExpressTech Quiz And Survey Master (WordPress plugin), published on 3 Nov 2022. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Multiple Insecure Direct Object References (IDOR) vulnerabilities in ExpressTech Quiz And Survey Master plugin <= 7.3.6 on WordPress.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2021-36906?

It affects 1 product.


Products: Expresstech Quiz and Survey Master.

## How do I fix CVE-2021-36906?

No fix has been published for CVE-2021-36906 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-36906 being exploited?

There is no known exploitation of CVE-2021-36906 in the wild and no public exploit code.

## Other vulnerabilities in ExpressTech Quiz And Survey Master (WordPress plugin)

- [CVE-2020-35949](https://insights.sbomify.com/CVE-2020-35949/): File upload in n/a (critical 10.0)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36906 and fix it if it is affected.

What it is: CVE-2021-36906 is a low-severity missing authorization vulnerability in ExpressTech Quiz And Survey Master (WordPress plugin), published on 3 Nov 2022. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-36906 in the wild and no public exploit code.

Affected product: ExpressTech Quiz And Survey Master (WordPress plugin). 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-2021-36906/ (Markdown: https://insights.sbomify.com/CVE-2021-36906/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36906
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36906
- OSV: https://osv.dev/vulnerability/CVE-2021-36906

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-36906/
Summaries are generated and may contain mistakes; the official description above is the record.