CVE-2026-55489 PUBLISHED

BigBlueButton: IDOR on BBB through /api/graphql via POST parameter "presentationId" leads to Authentication Bypass

Assigner: GitHub_M
Reserved: 16.06.2026 Published: 20.08.2026 Updated: 21.08.2026

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.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L
CVSS Score: 4.9

Product Status

Vendor bigbluebutton
Product bigbluebutton
Versions
  • Version < 3.0.29 is affected

References

Problem Types

  • CWE-639: Authorization Bypass Through User-Controlled Key CWE