How severe is CVE-2026-27467?

CVE-2026-27467 has a CVSS 3.x base score of 2.0, rated low severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-27467 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27467?

CVE-2026-27467 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27467?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-27467 have an EU (EUVD) identifier?

Yes. CVE-2026-27467 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7722.

When was CVE-2026-27467 published?

CVE-2026-27467 was published on 2026-02-21 and last updated on 2026-06-17.

CVE-2026-27467

CVE-2026-27467 is a low-severity vulnerability in Bigbluebutton with a CVSS 3.x base score of 2.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Low (CVSS 3.x base score 2.0)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-7722
Weakness: CWE-200
Affected product: Bigbluebutton
Published: 2026-02-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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. 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.
How severe is CVE-2026-27467?: CVE-2026-27467 has a CVSS 3.x base score of 2.0, rated low severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-27467 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27467?: CVE-2026-27467 affects Bigbluebutton. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27467?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-27467 have an EU (EUVD) identifier?: Yes. CVE-2026-27467 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7722.
When was CVE-2026-27467 published?: CVE-2026-27467 was published on 2026-02-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bigbluebutton:bigbluebutton:*:*:*:*:*:*:*:*

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