CVE-2026-46353
BigBlueButton API checksum bypass via presentationUploadExternalUrl
- State
- Published
- Severity
- 8.1 High
- Published
- Jul 16, 2026
- Updated
- Jul 16, 2026
- Reserved
- May 13, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N | GitHub_M |
Weaknesses
- CWE-284 Improper Access Control
Affected Products
| Product | Versions |
|---|---|
bigbluebuttonbigbluebutton |
|
References
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