CVE-2026-46351 — BigBlueButton: Insecure Randomness allows to guess user's conference session token and impersonate them
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/…
Published: 2026-07-16 · CVSS: 8.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7