# CVE-2021-36787: Cross-site Scripting in the femanager TYPO3 extension

> An attacker can execute arbitrary scripts in the victim's browser by uploading a crafted SVG document to the TYPO3 femanager extension.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A: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:** Yes
- **Published:** 13 Aug 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-f3rf-v9qm-9c89

## What is CVE-2021-36787?

CVE-2021-36787 is a medium-severity cross-site scripting vulnerability in n/a, published on 13 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The femanager extension before 5.5.1 and 6.x before 6.3.1 for TYPO3 allows XSS via a crafted SVG document.

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

## Which versions are affected by CVE-2021-36787?

4 open source packages ship an affected version, including in2code/femanager. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `in2code/femanager` | Packagist | All versions | 5.5.1 |
| `in2code/femanager` | Packagist | All versions | 5.5.1 |
| `in2code/femanager` | Packagist | From 6.0.0 | 6.3.1 |
| `in2code/femanager` | Packagist | From 6.0.0 | 6.3.1 |

Products: In2code Femanager.

## How do I fix CVE-2021-36787?

Upgrade in2code/femanager to a fixed version for your release line: 5.5.1 or 6.3.1.

## Is CVE-2021-36787 being exploited?

There is no known exploitation of CVE-2021-36787 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2023-25013](https://insights.sbomify.com/CVE-2023-25013/): Broken Access Control in 3rd party TYPO3 extension "femanager" (high 8.6)
- [CVE-2023-25014](https://insights.sbomify.com/CVE-2023-25014/): Broken Access Control in 3rd party TYPO3 extension "femanager" (high 8.6)
- [CVE-2014-6292](https://insights.sbomify.com/CVE-2014-6292/): TYPO3 femanager extension allows remote frontend users to modify or delete records of other frontend users (medium 6.4)
- [CVE-2022-44543](https://insights.sbomify.com/CVE-2022-44543/): TYPO3 Extension femanager vulnerable to Broken Access Control (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-36787 and fix it if it is affected.

What it is: CVE-2021-36787 is a medium-severity cross-site scripting vulnerability in n/a, published on 13 Aug 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-36787 in the wild and no public exploit code.

Affected packages and fixed versions:
- in2code/femanager (Packagist): affected all versions; fixed in 5.5.1
- in2code/femanager (Packagist): affected all versions; fixed in 5.5.1
- in2code/femanager (Packagist): affected from 6.0.0; fixed in 6.3.1
- in2code/femanager (Packagist): affected from 6.0.0; fixed in 6.3.1

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-2021-36787/ (Markdown: https://insights.sbomify.com/CVE-2021-36787/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-36787
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-36787
- OSV: https://osv.dev/vulnerability/CVE-2021-36787

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-36787/
Summaries are generated and may contain mistakes; the official description above is the record.