CVE-2025-61602
October 09, 2025
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.
Affected Packages
https://github.com/bigbluebutton/bigbluebutton.git (GITHUB):
Affected version(s) >=v0.7 <v3.0.13Fix Suggestion:
Update to version v3.0.13Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Check or Handling of Exceptional Conditions
EPSS
Base Score:
0.10
