BigBlueButton API checksum bypass via presentationUploadExternalUrl

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-46353
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 19:16:46 UTC
Updated2026-07-17 18:33:28 UTC
DescriptionBigBlueButton 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

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

EPSS: 0.002660000 probability, percentile 0.182730000 (date 2026-07-20)

Problem Types: CWE-284 | CWE-284 CWE-284: Improper Access Control

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Bigbluebutton Bigbluebutton affected < 3.0.21 Not specified

References

ReferenceSourceLinkTags
github.com/bigbluebutton/bigbluebutton/commit/36fd1b407488a0c56ce620b911... [email protected] github.com
github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2... [email protected] github.com
github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21 [email protected] github.com
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