PT-2026-60542 · Bigbluebutton · Bigbluebutton

CVE-2026-46351 · Published 2026-07-16 · Updated 2026-07-16

Mitre

CVSS v3.1

8.1

High

Base vector

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

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.

Fix

Use of Insufficiently Random Values

Weakness Enumeration

CWE-330

Related Identifiers

CVE-2026-46351

Affected Products

Bigbluebutton

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-46351 · Security Note
• https://github.com/bigbluebutton/bigbluebutton/commit/8457886c248aeba5597ee8749267602d6d117e98 · Note
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21 · Note
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-7959-pf2v-xc4h · Note