CVE-2026-27467
low-risk
Published 2026-02-21
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.
Do I need to act?
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0.03% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
2
CVSS 2.0/10
Low
NETWORK
/ HIGH complexity
Affected Products (1)
Affected Vendors
13
/ 100
low-risk
Severity
8/34 · Low
Exploitability
0/34 · Minimal
Exposure
5/34 · Minimal