Unrated severityNVD Advisory· Published Jul 16, 2026· Updated Jul 16, 2026
BigBlueButton API checksum bypass via presentationUploadExternalUrl
CVE-2026-46353
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.
Affected products
1- Range: <3.0.21
Patches
Vulnerability mechanics
References
3- github.com/bigbluebutton/bigbluebutton/commit/36fd1b407488a0c56ce620b91184d5a8aea68b3dmitrex_refsource_MISC
- github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21mitrex_refsource_MISC
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2m-cqffmitrex_refsource_CONFIRM
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