CVE-2026-27467
BigBlueButton: Audio from participants to the server initially unmuted
CVSS Score
2.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-200 |
| Vendor | bigbluebutton |
| Product | bigbluebutton |
| Published | Feb 21, 2026 |
| Last Updated | Feb 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None
Affected Versions
bigbluebutton / bigbluebutton
< 3.0.20