CVE-2025-61602
BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
- State
- Published
- Severity
- 7.5 High
- Published
- Oct 9, 2025
- Updated
- Oct 10, 2025
- Reserved
- Sep 26, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | GitHub_M |
Weaknesses
- CWE-703 Improper Check or Handling of Exceptional Conditions
Affected Products
| Product | Versions |
|---|---|
bigbluebuttonbigbluebutton |
|
References
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