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/main/java/org/bigbluebutton/api/Util.java and...