# CVE-2021-30109: Cross-site Scripting in Froala Editor

> Attackers can inject malicious scripts via crafted base64 strings in the hyperlink module, potentially executing code in user browsers.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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:** No
- **Published:** 5 Apr 2021
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-cq6w-w5rj-p9x8

## What is CVE-2021-30109?

CVE-2021-30109 is a medium-severity cross-site scripting vulnerability in n/a, published on 5 Apr 2021. 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

Froala Editor 3.2.6 is affected by Cross Site Scripting (XSS). Under certain conditions, a base64 crafted string leads to persistent Cross-site scripting (XSS) vulnerability within the hyperlink creation module.

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

## Which versions are affected by CVE-2021-30109?

2 open source packages ship an affected version, including froala-editor. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `froala-editor` | npm | All versions to 3.2.6 | None |
| `froala-editor` | npm | All versions to 3.2.6 | None |

Products: Froala Froala Editor.

## How do I fix CVE-2021-30109?

No fix has been published for CVE-2021-30109 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-30109 being exploited?

There is no known exploitation of CVE-2021-30109 in the wild and no public exploit code.

Public exploit code:

- Froala Persistent XSS (github_poc): https://github.com/Hackdwerg/CVE-2021-30109

## Other vulnerabilities in n/a

- [CVE-2023-43263](https://insights.sbomify.com/CVE-2023-43263/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2023-42426](https://insights.sbomify.com/CVE-2023-42426/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2020-22864](https://insights.sbomify.com/CVE-2020-22864/): Cross site scripting in froala-editor (medium 6.1)
- [CVE-2020-26523](https://insights.sbomify.com/CVE-2020-26523/): Froala WYSIWYG Editor XSS Vulnerability (medium 6.1)
- [CVE-2019-19935](https://insights.sbomify.com/CVE-2019-19935/): DOM-based cross-site scripting in Froala Editor (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-30109 and fix it if it is affected.

What it is: CVE-2021-30109 is a medium-severity cross-site scripting vulnerability in n/a, published on 5 Apr 2021. 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-2021-30109 in the wild and no public exploit code.

Affected packages and fixed versions:
- froala-editor (npm): affected all versions up to 3.2.6; no fix listed
- froala-editor (npm): affected all versions up to 3.2.6; no fix listed

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-2021-30109/ (Markdown: https://insights.sbomify.com/CVE-2021-30109/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-30109
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-30109
- OSV: https://osv.dev/vulnerability/CVE-2021-30109

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-30109/
Summaries are generated and may contain mistakes; the official description above is the record.