Unrated severityNVD Advisory· Published Oct 9, 2025· Updated Oct 10, 2025
BigBlueButton vulnerable to Chat DoS via invalid reactionEmojiId
CVE-2025-61602
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.
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Affected products
2<3.0.13+ 1 more
- (no CPE)range: <3.0.13
- (no CPE)range: < 3.0.13
Patches
Vulnerability mechanics
References
2- github.com/bigbluebutton/bigbluebutton/pull/23651mitrex_refsource_MISC
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-45j2-m26c-3pcmmitrex_refsource_CONFIRM
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