# CVE-2022-36028: BigBlueButton Greenlight Open Redirect vulnerability

> Attackers can redirect users to malicious sites via the login page's return_to cookie, potentially facilitating phishing attacks.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 25 Apr 2024
- **Updated:** 3 Aug 2024

## What is CVE-2022-36028?

CVE-2022-36028 is a critical vulnerability in bigbluebutton greenlight, published on 25 Apr 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Greenlight is an end-user interface for BigBlueButton servers. Versions prior to 2.13.0 have an open redirect vulnerability in the Login page due to unchecked the value of the `return_to` cookie. Versions 2.13.0 contains a patch for the issue.

Weakness: CWE-601 (URL Redirection to Untrusted Site)

## Which versions are affected by CVE-2022-36028?

It affects 1 product.


Products: Bigbluebutton Greenlight.

## How do I fix CVE-2022-36028?

No fix has been published for CVE-2022-36028 yet. Limit exposure of the affected software until one is available.

## Is CVE-2022-36028 being exploited?

There is no known exploitation of CVE-2022-36028 in the wild and no public exploit code.

## Other vulnerabilities in bigbluebutton greenlight

- [CVE-2022-36029](https://insights.sbomify.com/CVE-2022-36029/): BigBlueButton Greenlight Open Redirect vulnerability (critical 9.1)
- [CVE-2020-26163](https://insights.sbomify.com/CVE-2020-26163/): Open redirect in n/a (high 8.8)
- [CVE-2020-27642](https://insights.sbomify.com/CVE-2020-27642/): Cross-site scripting in n/a (medium 6.1)
- [CVE-2022-26497](https://insights.sbomify.com/CVE-2022-26497/): Cross-site scripting in n/a (medium 5.4)
- [CVE-2022-31039](https://insights.sbomify.com/CVE-2022-31039/): Improper privilege management - Anyone can view room settings in GreenLight (medium 4.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2022-36028 and fix it if it is affected.

What it is: CVE-2022-36028 is a critical vulnerability in bigbluebutton greenlight, published on 25 Apr 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2022-36028 in the wild and no public exploit code.

Affected product: bigbluebutton greenlight. 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-2022-36028/ (Markdown: https://insights.sbomify.com/CVE-2022-36028/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2022-36028
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-36028
- OSV: https://osv.dev/vulnerability/CVE-2022-36028

---
From sbomify Insights: https://insights.sbomify.com/CVE-2022-36028/
Summaries are generated and may contain mistakes; the official description above is the record.