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.
History

Thu, 26 Feb 2026 19:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*

Wed, 25 Feb 2026 10:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 23 Feb 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Bigbluebutton
Bigbluebutton bigbluebutton
Vendors & Products Bigbluebutton
Bigbluebutton bigbluebutton

Sat, 21 Feb 2026 07:30:00 +0000

Type Values Removed Values Added
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.
Title BigBlueButton: Audio from participants to the server initially unmuted
Weaknesses CWE-200
References
Metrics cvssV3_1

{'score': 2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-02-21T07:18:26.156Z

Updated: 2026-02-24T18:49:12.218Z

Reserved: 2026-02-19T17:25:31.101Z

Link: CVE-2026-27467

cve-icon Vulnrichment

Updated: 2026-02-24T18:49:04.296Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-21T08:16:11.827

Modified: 2026-02-26T18:54:09.117

Link: CVE-2026-27467

cve-icon Redhat

No data.