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.
History

Fri, 17 Jul 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 16 Jul 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Bigbluebutton
Bigbluebutton bigbluebutton
Vendors & Products Bigbluebutton
Bigbluebutton bigbluebutton

Thu, 16 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title BigBlueButton: Insecure Randomness allows to guess user's conference session token and impersonate them
Weaknesses CWE-330
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-07-16T17:58:53.070Z

Updated: 2026-07-17T13:59:11.141Z

Reserved: 2026-05-13T18:37:30.991Z

Link: CVE-2026-46351

cve-icon Vulnrichment

Updated: 2026-07-17T13:59:06.373Z

cve-icon NVD

No data.

cve-icon Redhat

No data.