BigBlueButton is an open-source virtual classroom. Prior to 3.0.23, BigBlueButton allowed authenticated moderators to inject SQL through the meetingId and userId values used by refreshBreakoutRoomsVisibleForUsers in akka-bbb-apps/src/main/scala/org/bigbluebutton/core/db/BreakoutRoomUserDAO.scala. The method interpolated those values into breakout room visibility queries, allowing arbitrary SQL execution against the application database. This issue is fixed in version 3.0.23.
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-gfv2-46v4-jvw5
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.23
https://github.com/bigbluebutton/bigbluebutton/commit/3365e340e0c102de0f8ea007c05053b562b6fa2b