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4.9

BigBlueButton lets presenter delete another meeting’s presentation

CVE-2026-55489 · published 2 months ago
Summary

Versions of BigBlueButton before 3.0.29 allow a presenter to delete a presentation that belongs to a different meeting by submitting its identifier. This can interrupt the other class’s session. Upgrade to BigBlueButton 3.0.29 or later to resolve the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
bigbluebutton bigbluebutton < 3.0.29
Original advisory text
BigBlueButton: IDOR on BBB through /api/graphql via POST parameter "presentationId" leads to Authentication Bypass
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.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
4.9 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-639Authorization Bypass Through User-Controlled Key
Timeline
Published20 Aug 2026
Updated4 Nov 2026
First seen20 Aug 2026
Sources
CVE-2026-55489 · NVD
CVE-2026-55489 · MITRE
GHSA-jxpq-r3h3-p75g · GHSA
CVE-2026-55489 · OSV
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