# CVE-2021-24934: Visual CSS Style Editor < 7.5.4 - Reflected Cross-Site Scripting

> An attacker can execute arbitrary scripts in an admin's browser via the wyp_page_type parameter, potentially leading to account takeover.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Feb 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-7579-2v4g-9grv

## What is CVE-2021-24934?

CVE-2021-24934 is a medium-severity cross-site scripting vulnerability in Unknown Visual CSS Style Editor, published on 1 Feb 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

The Visual CSS Style Editor WordPress plugin before 7.5.4 does not sanitise and escape the wyp_page_type parameter before outputting it back in an admin page, leading to a Reflected Cross-Site Scripting issue

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2021-24934?

It affects 1 product.


Products: Yellowpencil Visual Css Style Editor.

## How do I fix CVE-2021-24934?

No fix has been published for CVE-2021-24934 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24934 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-24934 exists.

Public exploit code:

- Visual CSS Style Editor < 7.5.4 - Cross-Site Scripting (nuclei): http/cves/2021/CVE-2021-24934.yaml

## Other vulnerabilities in Unknown Visual CSS Style Editor

- [CVE-2019-11886](https://insights.sbomify.com/CVE-2019-11886/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24934 and fix it if it is affected.

What it is: CVE-2021-24934 is a medium-severity cross-site scripting vulnerability in Unknown Visual CSS Style Editor, published on 1 Feb 2022. An attacker can exploit it over the internet without logging in, 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-2021-24934 exists.

Affected product: Unknown Visual CSS Style Editor. 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-2021-24934/ (Markdown: https://insights.sbomify.com/CVE-2021-24934/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24934
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24934
- OSV: https://osv.dev/vulnerability/CVE-2021-24934

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24934/
Summaries are generated and may contain mistakes; the official description above is the record.