CVE-2025-61602 – BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId

CVE ID : CVE-2025-61602

Published : Oct. 9, 2025, 9:15 p.m. | 1 hour, 22 minutes ago

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.

Severity: 7.5 | HIGH

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