BigBlueButton: Insecure Randomness allows to guess user's conference session token and impersonate them

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Summary

CVECVE-2026-46351
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-16 19:16:45 UTC
Updated2026-07-16 19:16:45 UTC
DescriptionBigBlueButton 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Problem Types: CWE-330 | CWE-330 CWE-330: Use of Insufficiently Random Values

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Bigbluebutton Bigbluebutton affected < 3.0.21 Not specified

References

ReferenceSourceLinkTags
github.com/bigbluebutton/bigbluebutton/commit/8457886c248aeba5597ee87492... [email protected] github.com
github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21 [email protected] github.com
github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-7959-pf2... [email protected] github.com
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