CVE-2023-43797: Bigbluebutton

Medium severity, CVSS 5.4. EPSS: 0.4% chance of exploitation in the next 30 days.

BigBlueButton is an open-source virtual classroom. Prior to versions 2.6.11 and 2.7.0-beta.3, Guest Lobby was vulnerable to cross-site scripting when users wait to enter the meeting due to inserting unsanitized messages to the element using unsafe innerHTML. Text sanitizing was added for lobby messages starting in versions 2.6.11 and 2.7.0-beta.3. There are no known workarounds.

Affected products

• Bigbluebutton Bigbluebutton: before 2.6.11 (fixed in 2.6.11); version 2.7.0 only

Published 2023-10-30. Last modified 2026-06-17.