# CVE-2021-47732: CMSimple 5.2 Stored Cross-Site Scripting via Filebrowser External Input

> Attackers can inject malicious JavaScript into the Filebrowser External input field, leading to persistent script execution when users interact with specific tabs.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA: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:** 23 Dec 2025
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-48vh-4wjm-4mch

## What is CVE-2021-47732?

CVE-2021-47732 is a medium-severity cross-site scripting vulnerability in CMSimple, published on 23 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

CMSimple 5.2 contains a stored cross-site scripting vulnerability in the Filebrowser External input field that allows attackers to inject malicious JavaScript. Attackers can place unfiltered JavaScript code that executes when users click on Page or Files tabs, enabling persistent script injection.

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

## Which versions are affected by CVE-2021-47732?

It affects 1 product.


Products: Cmsimple Cmsimple.

## How do I fix CVE-2021-47732?

No fix has been published for CVE-2021-47732 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47732 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47732 exists.

## Other vulnerabilities in CMSimple

- [CVE-2021-43741](https://insights.sbomify.com/CVE-2021-43741/): Path traversal in n/a (critical 9.8)
- [CVE-2024-57548](https://insights.sbomify.com/CVE-2024-57548/): Missing authorization in n/a (critical 9.1)
- [CVE-2021-47734](https://insights.sbomify.com/CVE-2021-47734/): CMSimple 5.4 Authenticated Local File Inclusion Remote Code Execution (high 8.6)
- [CVE-2021-47735](https://insights.sbomify.com/CVE-2021-47735/): CMSimple 5.4 Authenticated Remote Code Execution via Template Editing (high 8.6)
- [CVE-2024-58280](https://insights.sbomify.com/CVE-2024-58280/): CMSimple 5.15 Remote Command Execution via Extensions Configuration (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47732 and fix it if it is affected.

What it is: CVE-2021-47732 is a medium-severity cross-site scripting vulnerability in CMSimple, published on 23 Dec 2025. 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-2021-47732 exists.

Affected product: CMSimple. 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-2021-47732/ (Markdown: https://insights.sbomify.com/CVE-2021-47732/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47732
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47732
- OSV: https://osv.dev/vulnerability/CVE-2021-47732

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47732/
Summaries are generated and may contain mistakes; the official description above is the record.