VULNERABILITY INTELLIGENCE

CVE-2025-61602

CVSS score7.5 HIGH

EPSS probability0.39%

CISA KEVNot currently listed

Published2025-10-09

Last modified2026-10-19

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.