# CVE-2021-36828: WordPress WP Maintenance plugin <= 6.0.4 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability

> Authenticated administrators can inject malicious scripts into the WP Maintenance plugin, potentially leading to code execution or account takeover.

- **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:** 15 Apr 2022
- **Updated:** 28 Apr 2026
- **Also known as:** GHSA-5wg3-2hmj-xfr7

## What is CVE-2021-36828?

CVE-2021-36828 is a medium-severity cross-site scripting vulnerability in Florent Maillefaud WP Maintenance, published on 15 Apr 2022. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Authenticated (admin+) Stored Cross-Site Scripting (XSS) in WP Maintenance plugin <= 6.0.7 versions.

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

## Which versions are affected by CVE-2021-36828?

It affects 1 product.


Products: Wp Maintenance Project Wp Maintenance.

## How do I fix CVE-2021-36828?

No fix has been published for CVE-2021-36828 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-36828 being exploited?

There is no known exploitation of CVE-2021-36828 in the wild and no public exploit code.

## Other vulnerabilities in Florent Maillefaud WP Maintenance

- [CVE-2019-19979](https://insights.sbomify.com/CVE-2019-19979/): Cross-site scripting in n/a (high 8.8)
- [CVE-2022-30536](https://insights.sbomify.com/CVE-2022-30536/): WordPress WP Maintenance plugin <= 6.0.7 - Authenticated Stored Cross-Site Scripting (XSS) vulnerability (low 3.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36828 and fix it if it is affected.

What it is: CVE-2021-36828 is a medium-severity cross-site scripting vulnerability in Florent Maillefaud WP Maintenance, published on 15 Apr 2022. 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-2021-36828 in the wild and no public exploit code.

Affected product: Florent Maillefaud WP Maintenance. 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-2021-36828/ (Markdown: https://insights.sbomify.com/CVE-2021-36828/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36828
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36828
- OSV: https://osv.dev/vulnerability/CVE-2021-36828

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36828/
Summaries are generated and may contain mistakes; the official description above is the record.