# CVE-2021-32828: Regular expression Denial of Service in MooTools

> Attackers can inject scripts via the OAuth2 API, potentially escalating to remote code execution through the automation API.

- **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:** No
- **Published:** 5 Jan 2023
- **Updated:** 10 Mar 2025
- **Also known as:** GHSA-x347-fc9w-w7c3

## What is CVE-2021-32828?

CVE-2021-32828 is a medium-severity cross-site scripting vulnerability in Hyland Nuxeo, published on 5 Jan 2023. 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 Nuxeo Platform is an open source content management platform for building business applications. In version 11.5.109, the `oauth2` REST API is vulnerable to Reflected Cross-Site Scripting (XSS). This XSS can be escalated to Remote Code Execution (RCE) by levering the automation API.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2021-32828?

2 open source packages ship an affected version, including org.nuxeo.ecm.platform:nuxeo-platform-oauth. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `org.nuxeo.ecm.platform:nuxeo-platform-oauth` | Maven | All versions to 10.10 | None |
| `org.nuxeo.ecm.platform:nuxeo-platform-oauth` | Maven | All versions to 10.10 | None |

Products: Hyland Nuxeo.

## How do I fix CVE-2021-32828?

No fix has been published for CVE-2021-32828 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-32828 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-32828 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-32828 and fix it if it is affected.

What it is: CVE-2021-32828 is a medium-severity cross-site scripting vulnerability in Hyland Nuxeo, published on 5 Jan 2023. 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-2021-32828 exists.

Affected packages and fixed versions:
- org.nuxeo.ecm.platform:nuxeo-platform-oauth (Maven): affected all versions up to 10.10; no fix listed
- org.nuxeo.ecm.platform:nuxeo-platform-oauth (Maven): affected all versions up to 10.10; 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-2021-32828/ (Markdown: https://insights.sbomify.com/CVE-2021-32828/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-32828
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-32828
- OSV: https://osv.dev/vulnerability/CVE-2021-32828

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-32828/
Summaries are generated and may contain mistakes; the official description above is the record.