# CVE-2021-34626: WP Upload Restriction <= 2.2.3 - Missing Access Control in deleteCustomType function

> Low-level authenticated users can delete administrator-defined custom file extensions due to missing access control in the WP Upload Restriction plugin.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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:** 7 Jul 2021
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-2935-f8mx-xc5w

## What is CVE-2021-34626?

CVE-2021-34626 is a medium-severity missing authorization vulnerability in WP Upload Restriction, published on 7 Jul 2021. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in the deleteCustomType function of the WP Upload Restriction WordPress plugin allows low-level authenticated users to delete custom extensions added by administrators. This issue affects versions 2.2.3 and prior.

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2021-34626?

It affects 1 product.


Products: Wp-Upload-Restriction Project Wp-Upload-Restriction.

## How do I fix CVE-2021-34626?

No fix has been published for CVE-2021-34626 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-34626 being exploited?

There is no known exploitation of CVE-2021-34626 in the wild and no public exploit code.

## Other vulnerabilities in WP Upload Restriction

- [CVE-2021-34625](https://insights.sbomify.com/CVE-2021-34625/): WP Upload Restriction <= 2.2.3 - Authenticated Stored Cross-Site Scripting (medium 6.4)
- [CVE-2021-34627](https://insights.sbomify.com/CVE-2021-34627/): WP Upload Restriction <= 2.2.3 - Missing Access Control in getSelectedMimeTypesByRole function (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-34626 and fix it if it is affected.

What it is: CVE-2021-34626 is a medium-severity missing authorization vulnerability in WP Upload Restriction, published on 7 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-2021-34626 in the wild and no public exploit code.

Affected product: WP Upload Restriction. 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-2021-34626/ (Markdown: https://insights.sbomify.com/CVE-2021-34626/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-34626
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-34626
- OSV: https://osv.dev/vulnerability/CVE-2021-34626

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-34626/
Summaries are generated and may contain mistakes; the official description above is the record.