CVE-2026-55491

BigBlueButton versions prior to 3.0.29 have a stored XSS flaw: the meetingName field is rendered unescaped in record-and-playback/screenshare/playback/index.html.erb, so a low-privileged user can inject script that runs when another user replays the recording. CVSS 3.1 scores 5.4 (Medium). Upgrad...

CVE-2026-55491 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...