CVE-2026-46353

HighCVSS 8.1/10Last modified Jul 17, 2026

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.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-284

Affected software

Vendor	Product	Versions
bigbluebutton	bigbluebutton	< 3.0.21

References

Timeline

Published: Jul 16, 2026
Last modified: Jul 17, 2026
NVD status: Deferred

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