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.
History

Fri, 10 Oct 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 10 Oct 2025 11:30:00 +0000

Type Values Removed Values Added
First Time appeared Bigbluebutton
Bigbluebutton bigbluebutton
Vendors & Products Bigbluebutton
Bigbluebutton bigbluebutton

Thu, 09 Oct 2025 21:00:00 +0000

Type Values Removed Values Added
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.
Title BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
Weaknesses CWE-703
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-10-09T20:40:04.658Z

Updated: 2025-10-10T14:30:50.944Z

Reserved: 2025-09-26T16:25:25.151Z

Link: CVE-2025-61602

cve-icon Vulnrichment

Updated: 2025-10-10T14:30:42.212Z

cve-icon NVD

Status : Received

Published: 2025-10-09T21:15:39.640

Modified: 2025-10-10T15:16:06.290

Link: CVE-2025-61602

cve-icon Redhat

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