8.1

CVE-2026-46353

BigBlueButton API checksum bypass via presentationUploadExternalUrl

BigBlueButton API checksum bypass via presentationUploadExternalUrl

BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web checksum validation could be bypassed when a presentationUploadExternalUrl parameter was supplied to API request handling in CreateMeeting.java and ValidationService.java, allowing a user to send valid requests to some endpoints without a checksum. This issue is fixed in version 3.0.21.
Mögliche Gegenmaßnahme
Server: We recommend updating to the patched version of BigBlueButton.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
Herstellerbigbluebutton
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Produkt bigbluebutton
Version < 3.0.21
Status affected
VulnDex Vulnerability Enrichment
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Weitere Schwachstelleninformationen
SystemBigBlueButton
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Produkt Server
Version < 3.0.21
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.27% 0.182
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 8.1 2.8 5.2
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-284 Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2m-cqff
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21
https://github.com/bigbluebutton/bigbluebutton/commit/36fd1b407488a0c56ce620b91184d5a8aea68b3d
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2m-cqff
Third Party Advisory