high7.1
CVE-2026-46355
BigBlueButton is an open-source virtual classroom.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| BigBlueButton Is An Open-Source Virtual Classroom. | before 3.0.23 |
Versions were read from the advisory text. No structured product data has been published for this record yet.