Is CVE-2026-46351 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-46351?

CVE-2026-46351 has a CVSS v3 severity of HIGH (8.1).

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CVE-2026-46351

Description

BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web generated conference sessionToken values with insufficiently secure randomness in bbb-common-web/src/main/java/org/bigbluebutton/api/Util.java and bigbluebutton-web/grails-app/controllers/org/bigbluebutton/web/controllers/ApiController.groovy, allowing a session user to predict other users' conference session tokens and impersonate them. This issue is fixed in version 3.0.21.