CVE-2026-55489: Bigbluebutton

Medium severity, CVSS 4.9. EPSS: 0.3% chance of exploitation in the next 30 days.

BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton presenters could submit a presentationId through /api/graphql that identified a presentation belonging to another meeting. akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/presentationpod/RemovePresentationPubMsgHdlr.scala did not verify the presentation's meeting identifier before deletion, allowing a presenter who knew the identifier to delete another meeting's presentation and disrupt its availability. This issue is fixed in version 3.0.29.

Affected products

• Bigbluebutton Bigbluebutton: before 3.0.29 (fixed in 3.0.29)

Published 2026-08-20. Last modified 2026-09-16.