CVE-2026-27467: BigBlueButton is an open-source virtual classroom

Q: How do I fix CVE-2026-27467?

bigbluebutton: upgrade to 3.0.20. Exact commands for each OS are on this page.

Q: Is CVE-2026-27467 being exploited?

CVE-2026-27467 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-27467 affect?

CVE-2026-27467 affects bigbluebutton. Severity is low (CVSS 2.0). 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, s

Q: How urgent is CVE-2026-27467?

Priority 10/100. No elevated risk signals yet.

Routine

LOW 2.0UPGRADE

CVE-2026-27467 is a low-severity flaw (CVSS 2.0) affecting bigbluebutton. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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. Th

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	2.0 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-200
Published	2026-02-21
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: bigbluebutton

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-21 08:16 UTCPublished CVE record published
2026-06-17 10:27 UTCUpdated Record last modified

bigbluebutton bigbluebutton UPGRADE

Affected: < 3.0.20

Fixed in: 3.0.20

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy bigbluebutton || rpm -q bigbluebutton || bigbluebutton --version

2. UPGRADE to 3.0.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bigbluebutton

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bigbluebutton

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27467?

bigbluebutton: upgrade to 3.0.20. Exact commands for each OS are on this page.

Is CVE-2026-27467 being exploited?

CVE-2026-27467 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27467 affect?

CVE-2026-27467 affects bigbluebutton. Severity is low (CVSS 2.0). 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, s

How urgent is CVE-2026-27467?

Priority 10/100. No elevated risk signals yet.

Related CVEs

CVE-2025-61601 HIGH 7.5 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2025-61602 HIGH 7.5 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2025-55200 HIGH 7.1 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2026-27736 MEDIUM 6.1 UPGRADE BigBlueButton is an open-source virtual classroom
CVE-2026-27466 HIGH 7.2 UPGRADE BigBlueButton is an open-source virtual classroom

References

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