Description
BigBlueButton is an open-source virtual classroom. A denial-of-service (DoS) vulnerability in versions prior to 3.0.13 allows any authenticated user to crash the chat functionality for all participants in a meeting by sending a malformed `reactionEmojiId` in the GraphQL mutation `chatSendMessageReaction`. Version 3.0.13 contains a patch. No known workarounds are available.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| bigbluebutton | bigbluebutton | < 3.0.13 | — |
Advisories 1
- WID-SEC-2025-2248 BigBlueButton: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 9, 2025