BigBlueButton: Stored XSS in Screenshare Recording Playback via Unescaped Meeting Name
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…
Severity medium: primary CNA CVSS 5.4 v3.1 (worst CNA-provided scenario) Not listed in this KEV snapshot. Forecast present in this snapshot.
Published 2026-08-20T21:35:42.546Z. Updated 2026-08-21T15:50:11.735Z.