CVE-2026-55489 (GCVE-0-2026-55489)

Vulnerability from cvelistv5 – Published: 2026-08-20 21:36 – Updated: 2026-08-21 11:23
VLAI
Title
BigBlueButton: IDOR on BBB through /api/graphql via POST parameter "presentationId" leads to Authentication Bypass
Summary
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.
Severity
4.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 11:22 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8129 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
bigbluebutton bigbluebutton Affected: < 3.0.29
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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