Detections
Analytics
CVE-2026-55491
medium
Description
BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton failed to escape meetingName in record-and-playback/screenshare/playback/index.html.erb when generating the screenshare playback format. A low-privileged user could store a crafted meeting name that embedded script content, and the script executed in another user's browser when that user replayed the recording. This issue is fixed in version 3.0.29.
References
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c888-74f9
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29
https://github.com/bigbluebutton/bigbluebutton/commit/a53f2b92022388bfa4109d3136d1f3a932404b1b