Low 2.0Published Feb 21, 2026

CVE-2026-27467BigBlueButton: Audio from participants to the server initially unmuted

Updated under an hour ago (Oct 27, 2026, 4:50 AM ET)

Does this affect you?

It affects bigbluebutton. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for bigbluebutton

Exploited in the last 30 days

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: 2.0 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Feb 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

bigbluebutton bigbluebutton bigbluebutton:bigbluebutton (from the name)	before 3.0.20	CNA record
bigbluebutton bigbluebutton bigbluebutton:bigbluebutton	before 3.0.20	NVD

References

References

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-6gj9-5rhm-68j8	x-refsource-confirm, patch, vendor-advisory
https://github.com/bigbluebutton/bigbluebutton/commit/3aa47832bc2b17178799bd932453c226e8f95703	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.