CVE-2026-27467— BigBlueButton: Audio from participants to the server initially unmuted
Quick assessment
Affected
bigbluebutton bigbluebutton
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 3.0.19及之前版本存在信息泄露漏洞，该漏洞源于麦克风静音状态下客户端仍发送音频数据，可能导致恶意服务器运营商访问音频数据。
Possible ATT&CK Techniques 1 AI
T1113 · Screen Capture
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-27467
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
BigBlueButton: Audio from participants to the server initially unmuted
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
BigBlueButton 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BigBlueButton是BigBlueButton社区的一套开源的Web会议系统。 BigBlueButton 3.0.19及之前版本存在信息泄露漏洞，该漏洞源于麦克风静音状态下客户端仍发送音频数据，可能导致恶意服务器运营商访问音频数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bigbluebutton | bigbluebutton | < 3.0.20 | - |
|
II. Public POCs for CVE-2026-27467
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-27467
请登录查看更多情报信息。
IV. Related Vulnerabilities
Same product: bigbluebutton
-
CVE-2026-55489
BigBlueButton: IDOR on BBB through /api/graphql via POST par -
CVE-2026-55491
BigBlueButton: Stored XSS in Screenshare Recording Playback -
CVE-2026-46355
BigBlueButton: Unauthenticated Session Hijack via Exposed /b -
CVE-2026-46682
BigBlueButton: Blind SQL Injection AUTH (Moderator) -
CVE-2026-46353
BigBlueButton API checksum bypass via presentationUploadExte
Same vendor: bigbluebutton
-
CVE-2026-55489
BigBlueButton: IDOR on BBB through /api/graphql via POST par -
CVE-2026-55491
BigBlueButton: Stored XSS in Screenshare Recording Playback -
CVE-2026-46355
BigBlueButton: Unauthenticated Session Hijack via Exposed /b -
CVE-2026-46682
BigBlueButton: Blind SQL Injection AUTH (Moderator) -
CVE-2026-46353
BigBlueButton API checksum bypass via presentationUploadExte
Same weakness: CWE-200
-
CVE-2026-105120
OpenAM before 16.1.3 Cross-Realm Session Disclosure via Sess -
CVE-2026-71883
Native AES packet cipher returns the raw AES key on an alias -
CVE-2026-100149
WPZOOM Connect: AI Chat, Click to Chat, Social Icons & Share -
CVE-2026-105030
Kener 4.0.0 before 4.1.6 Hidden Monitor Data Disclosure via -
CVE-2026-104476
Backdrop CMS before 1.35.1 Information Disclosure via Config
V. Comments for CVE-2026-27467
No comments yet