CVE-2024-38518: Bigbluebutton

Medium severity, CVSS 4.6. EPSS: 0.3% chance of exploitation in the next 30 days.

BigBlueButton is an open-source virtual classroom designed to help teachers teach and learners learn. An attacker with a valid join link to a meeting can trick BigBlueButton into generating a signed join link with additional parameters. One of those parameters may be "role=moderator", allowing an attacker to join a meeting as moderator using a join link that was originally created for viewer access. This vulnerability has been patched in version(s) 2.6.18, 2.7.8 and 3.0.0-alpha.7.

Affected products

• Bigbluebutton Bigbluebutton: before 2.6.18 (fixed in 2.6.18); from 2.7.0, before 2.7.8 (fixed in 2.7.8); from 2.8.0, before 3.0.0-alpha.7 (fixed in 3.0.0-alpha.7)

Published 2024-06-28. Last modified 2026-06-17.