CVE-2025-61602

Published October 9th, 2025

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CVSS v3

7.5

HIGH

CVSS v2

N/A

Affected

PROJECT

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.

bigbluebutton/bigbluebutton

A complete web conferencing system for virtual classes and more!

GitHub

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