# CVE-2021-31330: Cross-site scripting in n/a

> An authenticated attacker can inject persistent malicious JavaScript via Markdown editing in Review Board, potentially leading to code execution or account takeover.

- **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:** 11 May 2022
- **Updated:** 3 Aug 2024
- **Also known as:** BIT-reviewboard-2021-31330, GHSA-mhg9-m5gc-hhqw

## What is CVE-2021-31330?

CVE-2021-31330 is a medium-severity cross-site scripting vulnerability in n/a, published on 11 May 2022. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

A Cross-Site Scripting (XSS) vulnerability exists within Review Board versions 3.0.20 and 4.0 RC1 and earlier. An authenticated attacker may inject malicious Javascript code when using Markdown editing within the application which remains persistent.

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

## Which versions are affected by CVE-2021-31330?

1 open source package ship an affected version, including reviewboard. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `reviewboard` | Bitnami | From 3.0.20 to 3.0.20 | None |

Products: Reviewboard Review Board.

## How do I fix CVE-2021-31330?

No fix has been published for CVE-2021-31330 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31330 being exploited?

There is no known exploitation of CVE-2021-31330 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2014-5028](https://insights.sbomify.com/CVE-2014-5028/): Information disclosure in n/a (medium 6.5)
- [CVE-2014-5027](https://insights.sbomify.com/CVE-2014-5027/): Cross-site scripting in n/a (medium 4.3)
- [CVE-2013-4795](https://insights.sbomify.com/CVE-2013-4795/): Cross-site scripting in n/a (medium 4.3)
- [CVE-2013-4519](https://insights.sbomify.com/CVE-2013-4519/): Cross-site scripting in n/a (medium 4.3)
- [CVE-2013-2209](https://insights.sbomify.com/CVE-2013-2209/): Review Board Cross-site scripting (XSS) vulnerability in the reviews dropdown (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31330 and fix it if it is affected.

What it is: CVE-2021-31330 is a medium-severity cross-site scripting vulnerability in n/a, published on 11 May 2022. 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-2021-31330 in the wild and no public exploit code.

Affected packages and fixed versions:
- reviewboard (Bitnami): affected from 3.0.20 up to 3.0.20; 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-2021-31330/ (Markdown: https://insights.sbomify.com/CVE-2021-31330/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31330
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31330
- OSV: https://osv.dev/vulnerability/CVE-2021-31330

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-31330/
Summaries are generated and may contain mistakes; the official description above is the record.