---
cve: "CVE-2026-55489"
severity: "MEDIUM"
cvss: 4.9
epss: "0.2%"
vendor: "bigbluebutton"
kev: false
exploited: false
published: "2026-08-20 22:17:22"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-09-23T12:31:30+02:00"
---

# CVE-2026-55489

> 4.9 MEDIUM · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Keine | good |
| I Integrität | Gering | warn |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- c9e93f9af07b9661e286d101b83cbccb891c551f (Commit)
- e9d0534de2f014d1903d8c54885ca6acd5758a69 (Commit)

## Referenzen

- <https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-jxpq-r3h3-p75g>
- <https://github.com/bigbluebutton/bigbluebutton/commit/c9e93f9af07b9661e286d101b83cbccb891c551f>
- <https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-55489) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_