# CVE-2021-24366: Admin Columns Free < 4.3 & Pro < 5.5.1 - Admin+ Stored XSS in Label

> High-privilege users can inject malicious scripts via unsanitized label settings in Admin Columns plugins, enabling stored XSS attacks in multisite environments.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 21 Jun 2021
- **Updated:** 5 May 2025
- **Also known as:** GHSA-hrfw-7pg5-g3x6

## What is CVE-2021-24366?

CVE-2021-24366 is a medium-severity cross-site scripting vulnerability in Unknown Admin Columns, published on 21 Jun 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The Admin Columns WordPress plugin before 4.3 and Admin Columns Pro WordPress plugin before 5.5.1 do not sanitise and escape its Label settings, which could allow high privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in multisite setup)

## Which versions are affected by CVE-2021-24366?

It affects 1 product.


Products: Admincolumns Admin Columns.

## How do I fix CVE-2021-24366?

No fix has been published for CVE-2021-24366 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24366 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24366 exists.

## Other vulnerabilities in Unknown Admin Columns

- [CVE-2019-17661](https://insights.sbomify.com/CVE-2019-17661/): Code injection in n/a (high 8.8)
- [CVE-2021-24365](https://insights.sbomify.com/CVE-2021-24365/): Admin Columns Free (< 4.3.2) & Pro (< 5.5.2) - Authenticated Stored Cross-Site Scripting (XSS) in Custom Field (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24366 and fix it if it is affected.

What it is: CVE-2021-24366 is a medium-severity cross-site scripting vulnerability in Unknown Admin Columns, published on 21 Jun 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24366 exists.

Affected product: Unknown Admin Columns. 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-2021-24366/ (Markdown: https://insights.sbomify.com/CVE-2021-24366/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24366
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24366
- OSV: https://osv.dev/vulnerability/CVE-2021-24366

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24366/
Summaries are generated and may contain mistakes; the official description above is the record.