CVE-2025-61602
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductBigbluebutton
PublishedOct 9, 2025
First seenOct 9, 2025
Weakness typeCWE-703CWE-703
How to fix
Update
- bigbluebutton bigbluebutton3.0.13 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bigbluebutton bigbluebutton | v < 3.0.13 | 3.0.13 |
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