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CVE-2026-55489— BigBlueButton: IDOR on BBB through /api/graphql via POST parameter "presentationId" leads to Authentication Bypass

Quick assessment

Affected
bigbluebutton bigbluebutton
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

BigBlueButton 是一个开源的虚拟教室平台。在 3.0.29 版本之前，BigBlueButton 的演示者可以通过 /api/graphql 接口提交一个 presentationId（演示文稿标识符），该标识符可用于引用属于另一个会议的演示文稿。具体而言，文件 akka-bbb-apps/src/main/scala/org/bigbluebutton/core/apps/presentationpod/RemovePresentationPubMsgHdlr.scala 在删除演示文稿前未验证其所属

CVSS 4.9 · Medium EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
bigbluebutton bigbluebutton < 3.0.29 affected
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I. Basic Information for CVE-2026-55489

Vulnerability Information
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Vulnerability Title
BigBlueButton: IDOR on BBB through /api/graphql via POST parameter "presentationId" leads to Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
bigbluebutton bigbluebutton < 3.0.29 -

II. Public POCs for CVE-2026-55489

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III. Intelligence Information for CVE-2026-55489

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Patches & Fixes for CVE-2026-55489 (1)

Vendor Advisories for CVE-2026-55489 (1)

Vendor Pages for CVE-2026-55489 (1)

Same Patch Batch · bigbluebutton · 2026-08-20 · 4 CVEs total

CVE-2026-46682 8.5 HIGH BigBlueButton: Blind SQL Injection AUTH (Moderator)
CVE-2026-46355 7.1 HIGH BigBlueButton: Unauthenticated Session Hijack via Exposed /bigbluebutton/api/handleJoinExi
CVE-2026-55491 5.4 MEDIUM BigBlueButton: Stored XSS in Screenshare Recording Playback via Unescaped Meeting Name

IV. Related Vulnerabilities

Same product: bigbluebutton
Same vendor: bigbluebutton
Same weakness: CWE-639

V. Comments for CVE-2026-55489

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