# CVE-2021-39250: Cross-site scripting in n/a

> Stored XSS in Invision Community allows attackers to execute code and take over admin accounts via malicious file uploads in user content.

- **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:** 17 Aug 2021
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-3p7x-m58j-fm72

## What is CVE-2021-39250?

CVE-2021-39250 is a medium-severity cross-site scripting vulnerability in n/a, published on 17 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

Invision Community (aka IPS Community Suite or IP-Board) before 4.6.5.1 allows stored XSS, with resultant code execution, because an uploaded file can be placed in an IFRAME element within user-generated content. For code execution, the attacker can rely on the ability of an admin to install widgets, disclosure of the admin session ID in a Referer header, and the ability of an admin to use the templating engine (e.g., Edit HTML).

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

## Which versions are affected by CVE-2021-39250?

It affects 1 product.


Products: Invisioncommunity Invision Power Board.

## How do I fix CVE-2021-39250?

No fix has been published for CVE-2021-39250 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-39250 being exploited?

There is no known exploitation of CVE-2021-39250 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2012-5692](https://insights.sbomify.com/CVE-2012-5692/): Other in n/a (critical 10.0)
- [CVE-2013-3725](https://insights.sbomify.com/CVE-2013-3725/): Auth bypass in n/a (critical 9.8)
- [CVE-2012-2226](https://insights.sbomify.com/CVE-2012-2226/): File upload in n/a (critical 9.8)
- [CVE-2017-8898](https://insights.sbomify.com/CVE-2017-8898/): Cross-site scripting in n/a (critical 9.8)
- [CVE-2014-4928](https://insights.sbomify.com/CVE-2014-4928/): SQL injection in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-39250 and fix it if it is affected.

What it is: CVE-2021-39250 is a medium-severity cross-site scripting vulnerability in n/a, published on 17 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-2021-39250 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2021-39250/ (Markdown: https://insights.sbomify.com/CVE-2021-39250/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-39250
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-39250
- OSV: https://osv.dev/vulnerability/CVE-2021-39250

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-39250/
Summaries are generated and may contain mistakes; the official description above is the record.