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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/bigbluebutton/bigbluebutton/pull/23651 Issue Tracking, Patch
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm Exploit, Vendor Advisory
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · bigbluebuttonNVD modified 2026-10-19 16:10
Affected (CPE criteria) 1
cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*
References 3
- https://github.com/bigbluebutton/bigbluebutton/pull/23651 Issue Tracking, Patch
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm Exploit, Vendor Advisory
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcm Exploit, Vendor Advisory