# CVE-2021-24813: Events Made Easy < 2.2.24 - Admin+ Stored Cross-Site Scripting

> High-privilege users can inject malicious scripts via unsanitized custom field names in the Events Made Easy plugin, bypassing HTML filtering restrictions.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Nov 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-8jpj-47rv-xvr4

## What is CVE-2021-24813?

CVE-2021-24813 is a medium-severity cross-site scripting vulnerability in Unknown Events Made Easy, published on 1 Nov 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

The Events Made Easy WordPress plugin before 2.2.24 does not sanitise and escape Custom Field Names, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed

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

## Which versions are affected by CVE-2021-24813?

It affects 1 product.


Products: E-Dynamics Events Made Easy.

## How do I fix CVE-2021-24813?

No fix has been published for CVE-2021-24813 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24813 being exploited?

There is no known exploitation of CVE-2021-24813 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Events Made Easy

- [CVE-2022-1905](https://insights.sbomify.com/CVE-2022-1905/): Events Made Easy < 2.2.81 - Unauthenticated SQLi (critical 9.8)
- [CVE-2023-28660](https://insights.sbomify.com/CVE-2023-28660/): SQL injection in Events Made Easy WordPress Plugin (high 8.8)
- [CVE-2021-25030](https://insights.sbomify.com/CVE-2021-25030/): Events Made Easy < 2.2.36 - Subscriber+ SQL Injection (high 8.8)
- [CVE-2023-0404](https://insights.sbomify.com/CVE-2023-0404/): Events Made Easy <= 2.3.16 - Missing Authorization (medium 5.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24813 and fix it if it is affected.

What it is: CVE-2021-24813 is a medium-severity cross-site scripting vulnerability in Unknown Events Made Easy, published on 1 Nov 2021. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24813 in the wild and no public exploit code.

Affected product: Unknown Events Made Easy. 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-2021-24813/ (Markdown: https://insights.sbomify.com/CVE-2021-24813/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24813
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24813
- OSV: https://osv.dev/vulnerability/CVE-2021-24813

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24813/
Summaries are generated and may contain mistakes; the official description above is the record.