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LOW · 2.0

CVE-2026-27467

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. ...

Vulnerability 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.

CVSS Score

2.0

LOW

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 Products

VendorProductVersions
BigbluebuttonBigbluebutton< 3.0.20

Related Weaknesses (CWE)

CWE-200

References

FAQ

What is CVE-2026-27467?

CVE-2026-27467 is a vulnerability with a CVSS score of 2.0 (LOW). 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. ...

How severe is CVE-2026-27467?

CVE-2026-27467 has been rated LOW with a CVSS base score of 2.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-27467?

Check the references section above for vendor advisories and patch information. Affected products include: Bigbluebutton Bigbluebutton.