# CVE-2025-55200: BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes

> Attackers can inject malicious scripts via usernames in Shared Notes, allowing code execution in admin sessions.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Oct 2025
- **Updated:** 9 Oct 2025
- **Also known as:** GHSA-9jv9-cjrm-grj2

## What is CVE-2025-55200?

CVE-2025-55200 is a high-severity cross-site scripting vulnerability in bigbluebutton, published on 9 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.13, the "Shared Notes" feature contains a Stored Cross-Site Scripting (XSS) vulnerability with the input location being the "Username" field and the output location on the "Shared Notes" page, when a user with a malicious username is editing content. This vulnerability allows a low-privileged user to execute arbitrary JavaScript in the context of higher-privileged users (e.g., Admins) who open the Shared Notes page. Version 3.0.13 fixes the issue.

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

## Which versions are affected by CVE-2025-55200?

It affects 1 product.


Products: Bigbluebutton Bigbluebutton.

## How do I fix CVE-2025-55200?

No fix has been published for CVE-2025-55200 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-55200 being exploited?

There is no known exploitation of CVE-2025-55200 in the wild and no public exploit code.

## Other vulnerabilities in bigbluebutton

- [CVE-2020-27602](https://insights.sbomify.com/CVE-2020-27602/): Other in n/a (critical 9.8)
- [CVE-2020-27605](https://insights.sbomify.com/CVE-2020-27605/): Code injection in n/a (critical 9.8)
- [CVE-2020-12443](https://insights.sbomify.com/CVE-2020-12443/): Path traversal in n/a (critical 9.8)
- [CVE-2020-27613](https://insights.sbomify.com/CVE-2020-27613/): Hardcoded credentials in n/a (high 8.4)
- [CVE-2021-4143](https://insights.sbomify.com/CVE-2021-4143/): Cross-site Scripting (XSS) - Generic in bigbluebutton/bigbluebutton (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-55200 and fix it if it is affected.

What it is: CVE-2025-55200 is a high-severity cross-site scripting vulnerability in bigbluebutton, published on 9 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-55200 in the wild and no public exploit code.

Affected product: bigbluebutton. 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-2025-55200/ (Markdown: https://insights.sbomify.com/CVE-2025-55200/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-55200
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-55200
- OSV: https://osv.dev/vulnerability/CVE-2025-55200

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-55200/
Summaries are generated and may contain mistakes; the official description above is the record.