CVE-2026-46351
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductBigbluebutton
PublishedJul 16, 2026
First seenJul 16, 2026
Weakness typeCWE-330CWE-330
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bigbluebutton bigbluebutton | < 3.0.21 | — |
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