---
id: CVE-2026-55489
title: BigBlueButton is an open-source virtual classroom
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…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L'
cwe:
  - CWE-639
published: '2026-08-20'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T13:42:45.017'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55489'
references:
  - url: >-
      https://github.com/bigbluebutton/bigbluebutton/commit/c9e93f9af07b9661e286d101b83cbccb891c551f
    label: security-advisories@github.com
  - url: 'https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29'
    label: security-advisories@github.com
  - url: >-
      https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-jxpq-r3h3-p75g
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00193
epssPercentile: 0.09231
ingestedAt: '2026-09-16T13:56:12.596Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.