CVE-2026-27467
Low
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.
SeverityLow
CVSS2.0
Exploit probability—
ProductBigbluebutton
PublishedFeb 21, 2026
First seenFeb 21, 2026
Weakness typeCWE-200Sensitive information exposure
How to fix
Update
- bigbluebutton bigbluebutton3.0.20 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bigbluebutton bigbluebutton | v < 3.0.20 | 3.0.20 |
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