Is CVE-2026-46353 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-46353?

CVE-2026-46353 has a CVSS v3 severity of HIGH (8.1).

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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.