Security Advisory

CVE-2026-46355

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-08-20 21:34:40

Last updated 2026-08-20 21:34:40

Assigner GitHub_M

CVSS score 7.1

State PUBLISHED

Description

BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton exposed /bigbluebutton/api/handleJoinExistingUser through bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy. A requester able to supply an existingUserID for an active participant could reuse that participant's session and impersonate the participant in the same meeting because handleJoinExistingUser was a routable controller action rather than a private helper. This issue is fixed in version 3.0.23.

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