CVE-2025-61602 HIGH

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

Vendor Bigbluebutton
Product bigbluebutton
Weakness CWE-703
Published October 9, 2025
Last update October 10, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 9, 2025 CVE published
October 10, 2025 Record updated