# CVE-2020-7750: Cross-site Scripting (XSS)

> An attacker can inject arbitrary elements into the DOM via improper SVG escaping in the scratch-svg-renderer library, potentially leading to code execution.

- **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:** Yes
- **Published:** 21 Oct 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-j977-g5vj-j27g, SNYK-JS-SCRATCHSVGRENDERER-1020497

## What is CVE-2020-7750?

CVE-2020-7750 is a critical cross-site scripting vulnerability in scratch-svg-renderer, published on 21 Oct 2020. 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

This affects the package scratch-svg-renderer before 0.2.0-prerelease.20201019174008. The loadString function does not escape SVG properly, which can be used to inject arbitrary elements into the DOM via the _transformMeasurements function.

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

## Which versions are affected by CVE-2020-7750?

2 open source packages ship an affected version, including scratch-svg-renderer. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `scratch-svg-renderer` | npm | All versions | 0.2.0-prerelease.20201019174008 |
| `scratch-svg-renderer` | npm | All versions | 0.2.0-prerelease.20201019174008 |

Products: Mit Scratch-Svg-Renderer.

## How do I fix CVE-2020-7750?

Upgrade scratch-svg-renderer to 0.2.0-prerelease.20201019174008 or later.

## Is CVE-2020-7750 being exploited?

There is no known exploitation of CVE-2020-7750 in the wild and no public exploit code.

Public exploit code:

- Scratch Desktop 3.17 - Remote Code Execution (exploitdb)

## Other vulnerabilities in scratch-svg-renderer

- [CVE-2020-27428](https://insights.sbomify.com/CVE-2020-27428/): Cross-site Scripting in Scratch-Svg-Renderer (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-7750 and fix it if it is affected.

What it is: CVE-2020-7750 is a critical cross-site scripting vulnerability in scratch-svg-renderer, published on 21 Oct 2020. 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-2020-7750 in the wild and no public exploit code.

Affected packages and fixed versions:
- scratch-svg-renderer (npm): affected all versions; fixed in 0.2.0-prerelease.20201019174008
- scratch-svg-renderer (npm): affected all versions; fixed in 0.2.0-prerelease.20201019174008

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-2020-7750/ (Markdown: https://insights.sbomify.com/CVE-2020-7750/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-7750
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-7750
- OSV: https://osv.dev/vulnerability/CVE-2020-7750

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-7750/
Summaries are generated and may contain mistakes; the official description above is the record.