CVE-2026-27466 BigBlueButton: Exposed ClamAV port enables Denial of Service

BigBlueButton is an open-source virtual classroom. In versions 3.0.21 and below, the official documentation for "Server Customization" on Support for ClamAV as presentation file scanner contains instructions that leave a BBB server vulnerable for Denial of Service. The flawed command exposes both...

CVE-2026-27466 BigBlueButton: Exposed ClamAV port enables Denial of Service

BigBlueButton is an open-source virtual classroom. In versions 3.0.21 and below, the official documentation for "Server Customization" on Support for ClamAV as presentation file scanner contains instructions that leave a BBB server vulnerable for Denial of Service. The flawed command exposes both...

PT-2026-21365

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 allo...

BigBlueButton 安全漏洞

BigBlueButton is an open-source web conferencing system developed by the BigBlueButton community. Versions of BigBlueButton 3.0.21 and earlier contain security vulnerabilities. These vulnerabilities stem from improper ClamAV configuration instructions in the official documentation, which could...

BigBlueButton 信息泄露漏洞

BigBlueButton is an open-source web conferencing system developed by the BigBlueButton community. Versions of BigBlueButton 3.0.19 and earlier contained a vulnerability related to information leakage. This vulnerability occurred because the client still sent audio data even when the microphone wa...

PT-2026-21364

BigBlueButton is an open-source virtual classroom. In versions 3.0.21 and below, the official documentation for "Server Customization" on Support for ClamAV as presentation file scanner contains instructions that leave a BBB server vulnerable for Denial of Service. The flawed command exposes both...

CVE-2026-22800

PILOS Platform for Interactive Live-Online Seminars is a frontend for BigBlueButton. Prior to 4.10.0, Cross-Site Request Forgery CSRF vulnerability exists in an administrative API endpoint responsible for terminating all active video conferences on a single server. The affected endpoint performs ...

CVE-2022-26497

BigBlueButton Greenlight 2.11.1 allows XSS. A threat actor could have a username containing a JavaScript payload. The payload gets executed in the browser of the victim in the "Share room access" dialog if the victim has shared access to the particular room with the attacker previously...

CVE-2020-12443

BigBlueButton before 2.2.6 allows remote attackers to read arbitrary files because the presfilename lowercase value can be a .pdf filename while the presFilename mixed case value has a ../ sequence. This can be leveraged for privilege escalation via a directory traversal to...

CVE-2020-12113

BigBlueButton before 2.2.4 allows XSS via closed captions because dangerouslySetInnerHTML in React is used...

CVE-2024-39302

BigBlueButton is an open-source virtual classroom designed to help teachers teach and learners learn. An attacker may be able to exploit the overly elevated file permissions in the /usr/local/bigbluebutton/core/vendor/bundle/ruby/2.7.0/gems/resque-2.6.0 directory with the goal of privilege...

CVE-2023-43797

BigBlueButton is an open-source virtual classroom. Prior to versions 2.6.11 and 2.7.0-beta.3, Guest Lobby was vulnerable to cross-site scripting when users wait to enter the meeting due to inserting unsanitized messages to the element using unsafe innerHTML. Text sanitizing was added for lobby...

CVE-2023-43798

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to versions 2.6.12 and 2.7.0-rc.1 is vulnerable to Server-Side Request Forgery SSRF. This issue is a bypass of CVE-2023-33176. A patch in versions 2.6.12 and 2.7.0-rc.1 disabled follow redirect at httpclient.execute since the...

CVE-2022-31065

BigBlueButton is an open source web conferencing system. In affected versions an attacker can embed malicious JS in their username and have it executed on the victim's client. When a user receives a private chat from the attacker whose username contains malicious JavaScript, the script gets...

CVE-2022-31039

Greenlight is a simple front-end interface for your BigBlueButton server. In affected versions an attacker can view any room's settings even though they are not authorized to do so. Only the room owner and administrator should be able to view a room's settings. This issue has been patched in...

CVE-2022-31064

BigBlueButton is an open source web conferencing system. Users in meetings with private chat enabled are vulnerable to a cross site scripting attack in affected versions. The attack occurs when the attacker with xss in the name starts a chat. in the victim's client the JavaScript will be executed...

CVE-2022-27238

BigBlueButton version 2.4.7 or earlier is vulnerable to stored Cross-Site Scripting XSS in the private chat functionality. A threat actor could inject JavaScript payload in his/her username. The payload gets executed in the browser of the victim each time the attacker sends a private message to t...

CVE-2025-62781

PILOS Platform for Interactive Live-Online Seminars is a frontend for BigBlueButton. Prior to 4.8.0, users with a local account can change their password while logged in. When doing so, all other active sessions are terminated, except for the currently active one. However, the current session’s...

CVE-2025-62781

PILOS Platform for Interactive Live-Online Seminars is a frontend for BigBlueButton. Prior to 4.8.0, users with a local account can change their password while logged in. When doing so, all other active sessions are terminated, except for the currently active one. However, the current session’s...

EUVD-2025-36362

PILOS Platform for Interactive Live-Online Seminars is a frontend for BigBlueButton. PILOS before 4.8.0 exposes the PHP version via the X-Powered-By header, enabling attackers to fingerprint the server and assess potential exploits. This information disclosure vulnerability originates from PHP’s...