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CVE PROGRAM SOURCE RECORD2.0 Low

CVE-2026-27467

BigBlueButton: Audio from participants to the server initially unmuted

Description

BigBlueButton is an open-source virtual classroom. In versions 3.0.19 and below, when first joining a session with the microphone muted, the client sends audio to the server regardless of mute state. Media is discarded at the server side, so it isn't audible to any participants, but this may allow for malicious server operators to access audio data. The behavior is only incorrect between joining the meeting and the first time the user unmutes. This issue has been fixed in version 3.0.20.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

bigbluebutton bigbluebutton

  • < 3.0.20affected

References