Description
BigBlueButton is an open-source virtual classroom. In versions on the 3.x branch prior to 3.0.20, the string received with errorRedirectUrl lacks validation, using it directly in the respondWithRedirect function leads to an Open Redirect vulnerability. BigBlueButton 3.0.20 patches the issue. No known workarounds are available.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| bigbluebutton | bigbluebutton | >= 3.0.0, < 3.0.20 | — |
Advisories 1
- WID-SEC-2026-0488 BigBlueButton: Schwachstelle ermöglicht Darstellen falscher Informationen BSI CERT-Bund (WID) · Feb 25, 2026