CVE-2023-42804: Bigbluebutton

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

BigBlueButton is an open-source virtual classroom. BigBlueButton prior to version 2.6.0-beta.1 has a path traversal vulnerability that allows an attacker with a valid starting folder path, to traverse and read other files without authentication, assuming the files have certain extensions (txt, swf, svg, png). In version 2.6.0-beta.1, input validation was added on the parameters being passed and dangerous characters are stripped. There are no known workarounds.

Affected products

• Bigbluebutton Bigbluebutton: up to and including 2.5.18; version 2.6.0 only

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