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.
History

Thu, 16 Jul 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Bigbluebutton
Bigbluebutton bigbluebutton
Vendors & Products Bigbluebutton
Bigbluebutton bigbluebutton

Thu, 16 Jul 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 16 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Description 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.
Title BigBlueButton API checksum bypass via presentationUploadExternalUrl
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-16T18:41:31.957Z

Reserved: 2026-05-13T18:37:30.991Z

Link: CVE-2026-46353

cve-icon Vulnrichment

Updated: 2026-07-16T18:41:26.755Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-16T19:30:05Z