Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/bigbluebutton/bigbluebutton/commit/8457886c248aeba5597ee87492
- https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21
- https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-7959-pf2
FAQ
What is CVE-2026-46351?
CVE-2026-46351 is a vulnerability with a CVSS score of 8.1 (HIGH). 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/bigbluebu...
How severe is CVE-2026-46351?
CVE-2026-46351 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-46351?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.