# CVE-2020-37238: CMS Made Simple 2.2.15 Stored XSS via SVG File Upload

> Authenticated users can inject malicious scripts via SVG uploads, leading to session hijacking and cookie theft for other users.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/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:** 16 May 2026
- **Updated:** 24 May 2026
- **Also known as:** GHSA-r549-hx7w-7xr9

## What is CVE-2020-37238?

CVE-2020-37238 is a medium-severity cross-site scripting vulnerability in Cmsmadesimple CMS Made Simple, published on 16 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

CMS Made Simple 2.2.15 contains a stored cross-site scripting vulnerability that allows authenticated users with Content Manager access to inject malicious scripts through SVG file uploads. Attackers can upload SVG files containing embedded JavaScript to the file manager, which executes when other authenticated users access the uploaded file, enabling cookie theft and session hijacking.

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

## Which versions are affected by CVE-2020-37238?


## How do I fix CVE-2020-37238?

No fix has been published for CVE-2020-37238 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-37238 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37238 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-37238 and fix it if it is affected.

What it is: CVE-2020-37238 is a medium-severity cross-site scripting vulnerability in Cmsmadesimple CMS Made Simple, published on 16 May 2026. 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-2020-37238 exists.

Affected product: Cmsmadesimple CMS Made Simple. 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-2020-37238/ (Markdown: https://insights.sbomify.com/CVE-2020-37238/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-37238
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-37238
- OSV: https://osv.dev/vulnerability/CVE-2020-37238

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-37238/
Summaries are generated and may contain mistakes; the official description above is the record.