# CVE-2021-24228: Patreon WordPress < 1.7.2 - Reflected XSS on Login Form

> Reflected XSS in the Patreon WordPress plugin login form allows attackers to execute arbitrary scripts in victim browsers via unsanitized error logging input.

- **Severity:** Critical 9.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **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:** 12 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-3g9j-v8wq-8c77

## What is CVE-2021-24228?

CVE-2021-24228 is a critical cross-site scripting vulnerability in Unknown Patreon WordPress, published on 12 Apr 2021. 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 Jetpack Scan team identified a Reflected Cross-Site Scripting in the Login Form of the Patreon WordPress plugin before 1.7.2. The WordPress login form (wp-login.php) is hooked by the plugin and offers to allow users to authenticate on the site using their Patreon account. Unfortunately, some of the error logging logic behind the scene allowed user-controlled input to be reflected on the login page, unsanitized.

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

## Which versions are affected by CVE-2021-24228?

It affects 1 product.


Products: Patreon Patreon Wordpress.

## How do I fix CVE-2021-24228?

No fix has been published for CVE-2021-24228 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-24228 being exploited?

There is no known exploitation of CVE-2021-24228 in the wild and no public exploit code.

## Other vulnerabilities in Unknown Patreon WordPress

- [CVE-2018-20984](https://insights.sbomify.com/CVE-2018-20984/): Deserialization in n/a (critical 9.8)
- [CVE-2021-24229](https://insights.sbomify.com/CVE-2021-24229/): Patreon WordPress < 1.7.2 - Reflected XSS on patreon_save_attachment_patreon_level AJAX action (critical 9.6)
- [CVE-2021-24230](https://insights.sbomify.com/CVE-2021-24230/): Patreon WordPress < 1.7.0 - CSRF to Overwrite/Create User Meta (high 8.1)
- [CVE-2021-24227](https://insights.sbomify.com/CVE-2021-24227/): Patreon WordPress < 1.7.0 - Unauthenticated Local File Disclosure (high 7.5)
- [CVE-2021-24231](https://insights.sbomify.com/CVE-2021-24231/): Patreon WordPress < 1.7.0 - CSRF to Disconnect Sites From Patreon (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-24228 and fix it if it is affected.

What it is: CVE-2021-24228 is a critical cross-site scripting vulnerability in Unknown Patreon WordPress, published on 12 Apr 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-24228 in the wild and no public exploit code.

Affected product: Unknown Patreon WordPress. 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-2021-24228/ (Markdown: https://insights.sbomify.com/CVE-2021-24228/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-24228
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-24228
- OSV: https://osv.dev/vulnerability/CVE-2021-24228

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-24228/
Summaries are generated and may contain mistakes; the official description above is the record.