How serious is CVE-2026-27467?

This vulnerability has a CVSS score of 2.4 out of 10, classified as LOW severity. No public exploit code has been identified yet.

Which products are affected by CVE-2026-27467?

CVE-2026-27467 affects bigbluebutton bigbluebutton. Check the full CVE details for specific version information.

How do I fix CVE-2026-27467?

To remediate CVE-2026-27467, check for security patches from bigbluebutton. Apply all available updates and security patches. If no patch is available, implement recommended workarounds or security controls to mitigate the risk.

CVE-2026-27467

Low

|2.4

No Exploit

Plain English Summary

AI-powered analysis for quick understanding

This vulnerability allows a malicious server operator to potentially access audio data from users who join a BigBlueButton session with their microphone muted, even though the audio isn't heard by other participants. This issue occurs only between the time a user joins the meeting and when they first unmute their microphone, and it has been fixed in the latest version.

Technical 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.

CVSS Vector Analysis

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionRequired

Confidentiality ImpactLow

Integrity ImpactNone

Availability ImpactNone

ScopeUnchanged

Vector String

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N

Exploit Resources

Search for proof-of-concept code and exploit modules

GitHub Search Exploit-DB Nuclei Templates Metasploit Vulners

Official References

NIST NVD

Est. Bounty

$342($100-$500)

Vendor Response

Grade APatched in 5 days

Quick Information

Published

Feb 21, 2026

about 2 months ago

Last Modified

Feb 26, 2026

about 1 month ago

Vendor

bigbluebutton

Product

bigbluebutton

Related Vulnerabilities

CVE-2026-27466High

An attacker can exploit a vulnerability in BigBlueButton to overload the server or crash a critical process by sending large files, which can lead to a Denial of Service. This issue only affects users who followed specific instructions in the documentation and is fixed in the latest version.